Here's a rundown of what I believe and what I don't know so you can get a perspective on what at least one atheist thinks. I believe that universe exists. I believe that the universe was once very compact and it is now very far apart. This is effectively what the BBT says, nothing about actual creation. I do not know how the universe started, whether it started, or whether it even needs to have a cause or anything because absolutely nobody else knows that either. I don't know why the universe is expanding like it is, and considering the shoehorned-in nature of the idea of Dark Energy I don't think the people studying have much of a better idea. I don't think there is a god because there's no indication of it and certainly not the ones described in religions. I don't know what to think about the beginning of the universe because, as far as I can tell, there's very little indication for any of the current theories, it seems to largely be speculation and I don't think it will ever go much further beyond that. I think people need to accept that there are some things that we are just extremely unlikely to find out to any satisfying degree. Also Black Holes are stars that have collapsed on themselves to the point where their physical makeup causes really weird relativistic effects. We have evidence for their existence otherwise they wouldn't be a staple of astrophysics.