[Kamen Rider Die]

I think two blogs is plenty, and I think you've got the right idea as to how you'd divide them up. Keep all the pop culture stuff on one, and the religious stuff on another. As long as you make sure articles are tagged well on the pop culture site (every Power Rangers article should be tagged with a #powerrangers or #mmpr or whatever, just make sure it's consistent), you can have as many separate interests on there as you want. Visitors should be able to easily click through to see just the stuff that appeals to them. Some sort of navigational tool on the sidebar to quickly navigate to the parts that someone's looking for wouldn't hurt, either.

Best of luck with your sites!