Left Behind is a very poorly written series so it doesn't address any of this well but: most christians don't get raptured but also any child under 12? does regardless of religion. https://www.goodreads.com/book/show/25011483-the-anti-christ... (which uses the left behind books as a jumping off point) is worth reading as an explanation of the political world we live in.

The book sort of constantly forgets that every child under 12 in the world means that every one on the planet should be deeply traumatized.