Hmmm... Firstly, I just want to say that one should never feel bad about asking questions. Even if they provoke a negative response, something will be learned.
As for critique from non religious people... It does happen a lot, and sometimes it can pull the topic off topic. If one wanted to avoid that from happening, I might avoid the debate section.
I think the political climate lately has contributed to these attitudes, especially since many non religious folks have had negative experiences with religion... That's just me speculating, though.
I wouldn't let it get you down, however. At the end of the day, people and their criticisms don't have to walk a day in your shoes.