I have the opposite impression. Among Westerners Americans seem like the group where Christianity still plays the largest role in the average person's life. They talk about it a lot, to the point that I find it annoying. It's not just people who believe in it, the atheists and secular ones among them constantly complain about how bad religion is and how much they hate it. That's something you simply don't see in Western Europe, it's a topic that doesn't really come up much because most younger people don't care. They never go to church, they aren't involved with religious folks, they simply don't think about it at much.

The only other country I can think of that comes close would be Poland, if that counts as Western.