Your real existence on this earth is a sign of God's existence. Look around you, look at the heaven, the earth, the stars, the moon, the sun. Who is controlling this universe in a very accurate manner?
Look at your body and its sensitive systems and cells which govern it. These are sings of God's existence.
How did the universe come into being without a creator? How did the living being emerge? There must be a creator who is behind this flawless order of the universe.
Oh oh! Let this noob answer the easy questions.
Existence means God: No, simple as that, that is just a baseless assumption.
Heaven: What's Heaven?
Earth: Is a chunk of rocked formed by debris that clumped together after the ignition of our sun.
Moon: This was formed after a comet hit the earth on a hard angle, breaking off a chunk and forming, falling in a stable orbit around the earth.
Stars: See Sun-
Sun: Hydrogen clumped together and was forced in upon itself into a tight sphere, the gravity caused friction enough to raise the temperature to 15 million degrees, causing nuclear fission to occur.
The body was formed by millions of years of evolution, plenty of time to figure out systems that work, other words we would all spontaneously die.
The universe was created, more likely then not, by the big bang. Who says an eternal creator had to be behind it? Why not matter that is eternal, as there is NO evidence that the building blocks of matter EVER break down.
Chemical reactions occur on there own all the time, this could have formed simple life which then evolved, go buy sea monkey's.
And the universe is NOT in flawless order, in fact it's quite erratic, in fact in about 3 billion years we have a date with Andromeda.