I do belief God exists and created this universe, and as creator of this universe, God is not subject to its laws, and therefore falls completely outside the purview of science. This universe exists entirely because God wants it to, and God[0] could interfere with this universe at any time without leaving a trace, but clearly created a universe that is internally consistent[1].
Due to not being subject to this universe, God must by necessity also exist outside our concept of time (which is part of the universe according to Einstein), and therefore presumably causality. This follows logically from the above, but also conveniently solves an ancient dilemma about predestination.
I am Christian. I believe Jesus was some aspect of God that somehow became human, to teach us and to carry our sins. I believe the Bible is for the most part the result of divine revelation, but it has been written down by people, usually in the context of that time, and occasionally been rewritten, hopefully by well-meaning people.
Apart from the first paragraph, I'm not remotely sure of any of this. I'm a fairly agnostic Christian. To claim to know the truth about God would be the height of arrogance and hubris to me. I'm sure I'm wrong about some things, though I believe I'm relatively close on most.
I believe this because it makes sense to me. It explains the existence of the Bible, of Jesus, and of the religion He inspired, but it's strongly tempered by my understanding of science.
[0] I'm reluctant to call God "he" here, because it would suggest I believe God has gender, which I consider an silly idea. I do normally call him "he" though. Mostly out of habit.
[1] Except maybe in Quantum Mechanics, and possibly Inflation, because the former feels like a hack where we almost caught God in an inconsistency, and the latter feels like a cheat to get the universe he wanted.