Dear Viji,
In Hindu religion, there are many people who do not believe in God. Well, I agree with you that it may seem bad to a devotee of God. But, it has a positive side too. Because, instead of believing in something blindly, if people believe in it after discussions, then their belief will be much stronger, because then they will feel that their belief is really logical and not just because somebody asked them to believe in it.
You will definitely agree with me that it is the flexible neature of hindus that enables them to listen to the good things in other religions too.