I hate seeing it type. I will usually type out 'oh my gawsh' or something, but i don't even do that often. Ironically, as much as i hate seeing it typed out, i can have a tendency to say it verbally. I didn't notice it for a long time, and now that i do i am trying to stop.
I think people on CC say it because it's so common everywhere. Same with lmao and other things like that. Though the cussing is implied, Christians don't think twice to type it, even if they wouldn't spell it out.
But with the omg thing, i think there is a general lack of respect for God and Christ both, that's becoming prevalent in the modern church. And that plays a large role in this term.