Why is Reddit so hostile to Christians?

So I'm new here on Reddit and I've noticed this place is not really a place for Christians, it's been a while I've realized that, people there seem to have a deep hatred for Christianity that seems abnormal. In most subs, if you talk about christianity you will be immediately scorned and insulted, and get lots of downvotes. From what I've seen, Christians here are always treated like idiots who don't know anything and don't add anything to discussions. Even here in this sub there are more people with a negative view of Christians and Christianity than actual Christians.

What's the source of all this hate? Why does that happens more on Reddit especially?