I'm not totally sure what your asking, but what I believe is that if you have a religion you should be confident that what you believe is the truth and you should understand what you believe in. You should be able to defend your faith should you ever need to, however I think it is stupid how every aspect of religion is constantly criticized and nit-picked to death concerning every little detail, especially when the topis is the bible and/or God. To me it is kind of ridiculous! If you think about when you are/were at school, you generally trust your teacher or your textbook and accept that what they are teaching you is true. You don't nit-pick at every little fact they teach you and make them prove how it is true right down to the bone and if they slip up (because they are human) disregard everything they taught you as lies and call them a phoney! I suppose all I am trying to say is sometimes in life you have to have a little faith in people that when they are teaching you something or explaining something, they know what they are talking about.
As for me I have my own religious beliefs and I am confident that what I know is the truth and to me it is not so much faith as it is an understanding. At the same time I understand that there are many people in the world who would disagree with me and hence do not share the same beliefs as me and feel the same way about their religion as I do of mine. While I may not agree with their beliefs, I respect them for their beliefs and I am not one to try to stir up arguments over who is right.
So no, I do not believe religion should have to be defended, but should your beliefs be attacked, you should have enough knowledge about your beliefs to be able to defend them. If the attacker makes a valid point, it is probably worth your time to at least look into it before blindly rejecting it.
I also believe that nobody should be forced to change religions. You should only change religion based on an informed decision after seeing that the new religion better satisfies the spiritual hunger within you.