This is just a theory I am only mulling on!
The creator needed no creator as we think of it.
The energy that started the Universe as we know it has always existed.
Energy can neither be created or destroyed and all energy eventually returns to the source.
Scientific principle holds that positive and negative energy can not exist in the same place.
For each positive energy in the universe (planets etc) there is an equal negative energy.
The creator of this universe therefore is the natural disposition of positive and negative energy to reject each other the same as the ends of a magnet reject each other.
In this natural war of energy sources creation occurs. Bits of energy both positive and negative are flung off and energy becomes mass m=E/c2.
That is our planets and solar system and our earth including all living things.
As we die our energy is released (referred to as the spirit in religions) and returns eventually to the source (called God by religions).
Now if you want to take it a step further: Some religions believe our actions on earth are either positive or negative and refer to them as sins or blessings/works.
It is not unscientific to believe negative actions we commit result in a negative energy change in our body and vice versa for positive energy through blessings/works.
Therefore, if your life was spent committing negative actions (sins) you would have more negative energy than positive and you would return to the negative source of energy when you die and the opposite for positive energy and that explains the religious view of hell and heaven.
OK I have just explained the entire creation process and reason for our existence in a paragraph