Only read one of the Left Behind books, the "prequel" called Soon.
Yes, it was a bit heavy on the religious theme but doesn't proselytize. I'm not much into the religious-themed books but this one I found interesting. I'd like to read the others, if I can find them, but from what I understand, there's a dozen or more out there in the series.
I think if you're interested in the series then read the prequel since that would give you an idea of what the series is about and how "preachy" it is. BS (Cee64D) 48
WS (Me) 48
Your life is an occasion. Rise to it - Edward Magorium