This should be...well...oh, boy.
There is so much interesting material on atheism on YouTube. If you don't mind, I'd like to make a permanent dumping thread of YouTube gems that relate to religion. I have a couple that I'd like to share. If you're stuck, go look through DarkMatter2525's channel. Here are two of my favorites. The first one is silly, while the second one is a bit more serious.
This one is a clip that Richard Dawkins did for Reddit.