It's a possibility that there was a creator, but that wouldn't automatically make said creator a God. It is possible that an alien life form engineered the earliest forms of life on earth, and designed it in such a manner that the evolution of life on earth was designed to grow into what we know today. It could have been part of a doctoral thesis, some group that was designing synthetic life, or it could have just been some alien that was really bored. Look further, and the universe itself might have been created by some higher entity, but again it wouldn't automatically make said entity a God. Our universe might be in a test tube, lined up with many other test tubes as a part of some high school experiment. It might have been a god, but it can't be automatically assumed.
It is also possible there is no creator. Afterall, it isn't what went right in the universe that allowed us to live here, but rather everything that went wrong. We do have a moon because a meteor about the size of Mars crashed into Earth, sending chunks of the earth and this meteor into orbit, and the effects of the earth's gravitational pull was these chunks orbited around the earth, collected, and became the moon, which is essential for life on earth. As Stephen Hawking said, we shouldn't be surprised to be alive here, since this planet is capable of supporting life. The chances of randomness may seem so small they are insignificant, but anyone who has played craps, roulette, poker, or black jack knows, all you need is a very slight chance to win big.
The universe is far from perfect and flawless. Left untampered, the earth on it's own goes through many cycles. There are periods of very bad weather, such as ice ages. Mass volcanic eruptions have caused one mass extinction. A meteor colliding with earth caused another. I don't remember what caused the third. And again these are all naturally occurring events. And when the continents become one again, it is predicted that the weather on earth will turn extremely violent, and life will not be so easily sustained. There have been periods of heat, cold, drought, and precipitation that have had dire consequences on the earth's inhabitants.
Looking further out, the universe itself is also a very violent place. Some supernovas have been so powerful that they were visible during daylight hours on earths. Our own sun is going to exhaust it's source of fuel one day, rapidly expand, and take out Mercury, Venus, Earth, and maybe even Mars. Further down the road, it is likely that the Milky Way galaxy (our own galaxy) and the Andromeda galaxy are going to collide and merge into one galaxy. Do you know it would only take a black hole the size of a marble to engulf the earth? And as for "flawless" goes, the moon moves ever so slightly away from the earth. This means that eventually the moon is going to be so far away from the earth that the earth's rotation will go askew, and it might mean the end of life on earth.
The sheer magnitude and size of the universe speaks for itself of a Creator, a Master Designer. The
closest star to our sun, Proxima Centauri, is a distance of 4.2 light years or about 2.6 quadrillion miles. This distance alone boggles the mind, yet the distances that span the known universe are breath-taking, to say the least, for it's boundaries cannot be defined, if it has one.
Most never give any consideration to the analytical details that are now coming forth to show the
exacting precision necessary for it to exist. On what man has made, for example, a computer processor has an exacting voltage that must be stayed within in order to function properly. If the voltage is out of the finely tuned range, the processor may be destroyed or lock-up. This is by no accident that it requires the exact voltage in order to work effectively.
Likewise of the universe, for it is founded upon four perfectly balanced laws,
(1) electromagnetism,
(2) gravity,
(3) weak nuclear force, and
(4) the strong nuclear force. Only by these four forces being precisely balanced, is the universe maintaining it's exacting orderliness (and traveling apart at half the speed of light), such as the gravity of the earth, whereby we can eat and drink without our meal floating away, as in space when the astronauts are in the space station.
How is possible that these forces are so finely tuned for us to enjoy life ? And, are to believe that a precise computer processor, along with the rest of the computer that works as "one unit", is the product of an engineer's mind whereas the staggering immensity of the universe is just a random accident ?
When a late model car runs smoothly, did this just happen by accident or were there engineers that perhaps worked for years to design a system, that when maintained, continues to functions well ? For example, the tolerances of the lifters between the inner casing and it's housing inside of an engine is only .0008 (eight ten-thousandths of an inch), with a sheet of notebook paper being six times thicker or about .004 (four thousandths of an inch).
In the case of a car, it took a human engineer's mind to bring this car's lifter to reality, whereby we get the benefit of it in the quite running of an engine. Is it not more reasonable that a Supreme Maker engineered the universe, whereby the magnitude and complexity is baffling for us as humans ?
You purport that perhaps "an alien life form engineered the earliest forms of life on earth, and designed it in such a manner that the evolution of life on earth was designed to grow into what we know today." You are presenting a philosophical theory that many accept, or at least give credence to, especially those in scientific circles.
However, the math involved in
designing and maintaining the precise placement of all the
hundred of billions of galaxies (not counting the total number of stars) is well beyond any most-advanced mathematician to grasp the intricacy of numbers, much less an "alien". The sheer size and complexity requires that only a Supreme Being can account for the concept-to-completion of the universe. When one factors in the immense complexity of life that is harmonious around the earth also, this adds massively to the requirement of only one person who has the power and capabilities - Jehovah God.
A man named David, who lived some 3000 years ago, recognized that all the starry heavens were not the product of an "alien" but rather of God, for he wrote: "The heavens are declaring the glory of God; and of the work of his hands the expanse is telling." Because of this "glory", it causes many to speak out in behalf of God, for "one day after another causes speech to bubble forth, and one night after another shows forth knowledge."(Ps 19:1, 2)
How is you can think that the moon just accidentally just the right size for it's gravitational pull to cause the tides on the earth, saying that we "have a moon because a meteor about the size of Mars crashed into Earth" ? Let's start with the diameter of Mars. The diameter of Mars is 6,792 km across (about 4,075 miles). Just for comparison, that's only 53% the diameter of Earth. In other words, you could put two planets the size of Mars side by side and they would be a little bigger than Earth.
Now volume. The volume of Mars is 1.63 x 10
11 km
3. That's only 15% the volume of Earth. You could fit 6 planets the volume of Mars into the Earth and have room to spare. Finally, let's look at mass. The Mass of Mars is 6.4 x 10
23 kg. That translates to 11% the mass of Earth. Because
of its lower size and mass, the gravity on Mars is much lower too. You would
only experience 38% of Earth gravity standing on the surface of Mars. If you weight 100 kg (about 220 lbs) on Earth, you would only weight 38 kg (about 83 lbs) on Mars. The astronauts who have remained in space for a time, upon returning to the earth, have difficulty walking. So could a " a meteor about the size of Mars" have made both the moon and the earth just the precise size for life, having just the right "amount" of gravity ?
Is preciseness of an engine's mechanical parts in a car just a random accident, in which the tolerances are no more than .002 (two thousandths or half the thickness of a sheet of notebook paper) of an inch in rod-to-bearing clearance ? And if these tolerances are allowed to increase, then the engine's life-expectancy is greatly shortened and a knocking sound will start to be heard. So why the need for precision ? So that engines last for hundreds of thousands of miles. Likewise of the earth, for God has decreed that it remain forever, for Proverbs 3:19 says that "Jehovah himself in wisdom founded the earth. He
solidly fixed the heavens in discernment."