Arguments against Christianity via Science

Yeah, I have been not liking religion for a long time, but recently I befriended a highly religious Christian friend that was open to discussion

The problem is: I seem to think that whatever I try to refute him with is wrong, and my own experience with science and the natural study of everything is too small to make an accurate refrence as to how Christianity is disproved

I brought in some bullshit about evolution and biology, but I failed horribly

So give me some proof that is irrefutable or otherwise widely used

I know there was another thread like this, but it didn't specifically address the question

Here's the thing. If you want to be friends, find the points in what that friend says and be unified by them. It's your differences that define you as individuals, but definition doesn't unite, commonalities or common ground are what bring people together. So, when communicating with other people look for the common grounds, and use them to your friendly advantage. If your friend wishes to discuss the unifying factors and defining factors cooperatively through communication, than you have a respectful friend (respectful to himself), but if neither of you wishes to cooperate and look for in each other the common grounds, then it would probably be best to part ways until both parties can have a chance to learn a little about the human race and our history. I wish you the best of luck, it took me 30 years to finally figure it out, so, if you are still young enough, time is on your side for now. :)