I feel the same way you do about religion. I too have taken anthropology/biology classes, that have changed my view, and just seeing some people and being in certain situations has made me think twice about religion. I am not religious, though I did go to church when I was younger. My boyfriend is a Christian...not extreme, but we get into arguments every now and then about how we want to raise our kids,etc. I don't think you should convert unless you want to. Personally, I couldn't be a Christian (or any religion, for that matter) because I know too much about truth to try to force myself into thinking something else is true. If that made ANY sense. So if you want to, do. If not, don't. Maybe you and your boyfriend could split up on the holidays...you spend them with your family, he spends it with his...
It can work...all you need is love.