In Europe, even religious people don't take their religion seriously. It's rather a personal, cultural thing, something that makes one's soul feel good, something that creates communities, gives hope and consolation etc. It's put in a totally different sphere than worldly matters, like science, physics, biology etc. Religious talks even at ceremonies is always about how humans feel (and of course endlessly repeating the story of Jesus). But they don't usually touch topics that "smell" scientific and fact-like.

But this is quite a new development. It's hard for us to appreciate it, but there are other conceptions of religion's role in life. In the US, many religious people believe that things in the Bible literally describe how stuff is, it's not just an allegory or metaphor to help people in their lives. (Or similarly in Islam, the religion is not separate from all other aspects of life, but an inseparable part, without which nothing else makes sense).