I don't see that BOF has religious undertones but...
What if it does? Why would that be bad?

They always write songs about their lives so if faith is a part of it then they should write about that too... and you don't like it then you might be a little closed minded. Faith in popular music is everywhere, especially in the Country genre so you might actually see more of that from BJ.

Jon says he's not religious but he says he is spiritual... Meaning he believes in God but doesn't follow any specific religious institution. David is Jewish and the rest are catholic... i think. If they want to sing about their beliefs then they should.

As far as bells=church.... that's not true at all. We have towers with so-called Liberty Bells everywhere across the USA and not all of them are associated with churches.