Does God exist???

There are loads of questions i have thought over the last 22 yrs that dont seem to have an answer....

How did this earth come into existence.... u would give me a scientific explanation that gases and integration blah, blah, blah but now tell me how did these gases n all come into existence.

Y is the sky blue and not any other colour ? how do trees come into existence and y do they grow the way they do? y dont they grow upside down or in mid air? how did gravity come into existence?

Y r humans with 2 hands and 2 legs n not more? who made the design for the human body? who decided that we would have 206 bones and not more or less? who decided that mammals will be born alive and not thru eggs? y is an egg oval n not cube or cuboid?

now coming to trees and plants? how to they grow leaves and how to they make food thru photosynthesis? y do they shed leaves in winter?

y is water wet and y does it flow? who decided the colours things are gonna be? y are plants green and y is blood red?

All these questions may have scientific explanations but for those scientific explanations also there may be another question cropping up regarding its existence.

Can the answer be GOD? But then another question.....How did God come into existence?