I'm going to assume, and you should never assume but I'm going to here anyway, that you were raised with Christianity as the predominant religion in your area. At some point (or maybe all along) you figured there was no god. So you decided to stop being a Christian. But Christianity is more than just a religion. It's an entire culture. And with that culture are wonderful holiday's like Christmas and Easter. Sharing in these holiday's with others provide you with social benefits, and don't require a belief in god, or even Jesus.
So be a secular Christian. That's what I am. I don't go to church, I think the bible is filled with more nonsense than 50 shades of Grey, and I think giving money to churches is the biggest scam in the history of the world. But I celebrate and partake in Christian Traditions because they're part of the culture I grew up in. If my assumption above isn't correct, then there's really no reason for you to be a Christian. Many traditions we have today were stolen from the pagans anyway, and adopted by the Christians.
So be a secular Christian. That's what I am. I don't go to church, I think the bible is filled with more nonsense than 50 shades of Grey, and I think giving money to churches is the biggest scam in the history of the world. But I celebrate and partake in Christian Traditions because they're part of the culture I grew up in. If my assumption above isn't correct, then there's really no reason for you to be a Christian. Many traditions we have today were stolen from the pagans anyway, and adopted by the Christians.