There are some 50 million Evangelicals in the US who believe in the literal truth of Bible prophecy. All are fixated upon Israel. Because for a great many true believers, the end of the world is just the beginning.
The born again experience doesn't require a specific set of beliefs, but rather a specific social/emotional process; dogmas or explanations are secondary. It's not an experience unique to Christianity.
No matter what age the kids are or what the situation, telling them you no longer believe can be tricky. Help them to understand your changes as a matter of spiritual growth rather than spiritual abandonment.