By John Blake, CNN

(CNN) –"Yo mama..."

Whenever I heard those two words while growing up in inner-city Baltimore, I knew something bad was about to happen. Trading insults was a childhood ritual. But everyone understood that one subject was off-limits. You didn’t talk about anybody’s momma unless you were prepared to start swinging.

Now that I’m all grown-up, I’ve discovered a new arena for combat: The reader’s comments section for stories about religion.

When I first started writing about religion for an online news site, I eagerly turned to the comment section for my articles, fishing for compliments and wondering if I had provoked any thoughtful discussions about faith.

I don’t wonder anymore.

When I look at the comment section now, I see a whole lot of “yo mamas” being tossed about. Readers exchange juvenile insults, condescending lectures and veer off into tangents that have nothing to do with the article they just read.

For years, I’ve listened to these “holy trollers” in silence. Now I’m calling them out. I’ve learned that the same types of people take over online discussions about faith and transform them into the verbal equivalent of a food fight. You may recognize some of these characters.

You might even recognize yourself.

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