I'm not entirely sure what you think isn't offensive about your comment.

1. You are responding to the comment "Since when has it become fashionable to define oneself by religion?" (aside: the answer is since forever) in the affirmative

2. You find it "interesting" that "clearly rational and intelligent people have faith", by which you say that most people who have faith (and by association, Christians) are irrational and stupid.

3. You say that you believe that you expect those who have faith must be seriously uneducated.

4. You say that people who have faith use it as a crutch.

Hope this helps.

Being offended.

I am offended by you saying that people who have faith aren't irrational. That goes against my worldview and is therefore offensive to me.

Irrationality is cognition, thinking, talking or acting without inclusion of rationality. It is more specifically described as an action or opinion given through inadequate use of reason, emotional distress, or cognitive deficiency.

i wonder; do many people usually get offended merely by some abstract sense of "going against my worldview"?

Yes. That is exactly what being offended by verbal attacks to your religion is.

"verbal attacks to your religion" can mean many things, including abusive and disrespectful behavior, so it's unclear.

I have no problem with you sharing an observation. I do have an issue with you denigrating people who have faith.

Yep, I should stop sharing opinions on things that I simply fail to understand on any level.

I'm a bit touchy about this subject as I'm a Christian myself, so sorry if my response was a bit heated.

I can't reply directly to your apology, but there is no need to apologise.

Good Karma all around.