We grow up with an Epicurean world view (matter is all there is, the gods didn't create the universe, it's just independent atoms), which is the only reason why science and religion are at odds. Knowing that the universe started with the Big Bang doesn't preclude God in any fashion--the Epicurean worldview precludes God. In a theistic worldview the Big Bang is how God created the universe. Likewise, genetics doesn't preclude God creating life, the Epicurean worldview precludes that. How did the genetic code come to be? An Epicurean worldview says that it was all chance. A theistic worldview says that God created the genetic code, and you have lots of options to choose from that are consistent with evidence: God created the major changes (i.e. God caused much of the major evolution); or God is such a good engineer that he created the minimal amount once, in such a way that it would evolve into what he wants; or even that God is such a divine engineer that he created the universe such that it would naturally create what he desired without him having to do anything else.

I personally treat "God" as an anthropomorphism of concepts that are beyond my understanding. Just like some children might imagine that there's little people inside a TV, sometimes it's convenient to apply human characteristics to things I don't understand, especially during emotional distress or when dealing with weak-minded people.

Other times, it's better to take comfort in accepting that I can't know everything and realize that the scientific method tells us far more about this subject than imagination. It just requires a big dose of humility.

In no way do we fully understand things like the big bang or life.

How would we when we don't know what caused them.

Take some time to read "A Brief History of Time" by Stephen Hawkins. We know a lot more than you realize.