Often the way the questions are asked can be annoying.
"You mean you don't believe in the Bible?" or "Don't you feel the need for a savior?"
Often times people ask loaded questions, questions that cannot be answered directly without implying agreement with the beliefs of the one posing the question. For instance:
"Isn't it better to trust God's Word rather than the ideas of men?" or "Have you accepted God's Son Jesus Christ as your lord and savior?"
Yeah, I've noticed that too - a lot of people have an assumption that if you're raised in a faith, you are that faith forever. It's irritating, I'll agree.
I guess JW's can't afford to have that assumption or there would be no conversion.
When someone starts asking me questions like that, I typically answer with similiar questions, like:
"Have you accepted Jesus as your saviour?"
I'll reply: "Have you accepted Mohammed as the Prophet?"
That gets them riled up pretty quick. Usually they're the ones who land up getting mad at me!
One thing that does get me hot under the collar (although you'd never notice it) is when people consider their religions exclusive. They need to do some serious research, IMHO. I just tell them, every religion is the One True Religion.
When someone asks me anything about belief in a savior, I tell them I don't need one. If they have a bible with them, we go to Genesis, where Cain is driven out of the garden. Cain worries that if he is driven away from Eden, the people he meets will kill him. What people does he mean? The account also implies that he had no wife while in Eden (who would he marry, his own sister?). Logically then, there were people outside Eden, and his wife was found among those people living in the land east of Eden.
I tell people 'I am one of these other people living outside Eden. We didn't sin, so have no need for redemption. We were born right the first time.'