I've always understood Genesis to be largely metaphorical, which makes sense when you put it in the context of its creation. Discussing the literal stages in the creation of the world would have been off-putting and unnecessary for the people of the time, distracting from its core, theological message. Iirc, Genesis is thought to have been written almost 1500 BC. Therefore, scientific theories such as evolution and the Big Bang Theory can work in conjunction with the Bible. Religion doesn't intend to describe how, but why.
I wouldn't define myself as a (practicing) Christian, but I, too, had a Christian upbringing and believe religion can run alongside science. I'd also note that when people are citing the sun, the weather, the ocean etc. as evidence for a God, they are not saying that this is evidence for God because it cannot be explained scientifically, they are saying it is evidence for God because it seems too perfect to have happened by chance. Much as nobody would look at a watch and declare it had no designer because it is too complex and too perfect to have occurred by chance (Paley's watch analogy), many people also look at humanity - the nervous system, the human eye, defence in the body - and conclude that there is no way something so intricately 'planned' could have occurred by a series of lucky chances.
Neither religion nor science has all the answers but you can believe in the two mutually; while many would have you believe that you can only place your 'faith' in one or the other - and many would have you believe that all Christians are evolution-deniers - the vast majority of Christians and many scientists believe in both, and view them as able to exist in conjunction with one another, because they see the evidence for both.
It's up to you what you decide, just some potential answers to questions you seem to be struggling with. Just remember that whatever you conclude is OK, and there's no reason why you have to make a definitive decision right now; agnosticism is more than acceptable! Hope this helped a bit, and don't stress over it too much! (: