No, it's not a non sequitur. One may respect people despite those persons' ignorance. One is showing lack of respect for others and lack of self-respect by spending inordinate amounts of time where the opposition is en masse (a religions forum) and speaking against ALL of those persons' fundamental creeds, without any evidence.
People who do this are usually called "in a cult".
You've said it three times, but I think you need to do a spin, and click your heels for it to become real. Or maybe that's Beetlejuice. Dunno.
Speaking for myself, I don't see theists as 'opposition'. Which is not quite the same as saying SOME theists definitely are, on a more personal level. But then again, some atheists are too.
Small note, though...unlike vampires and garlic, atheists are not repelled by the word 'religious'. Speaking for myself, I find it very interesting.