My family in Nepal still worships idols. Do I feel good about it? of course not. But I don't force my views on them either. I love them, but I don't have the right to force my belief on them. I pray for them, and God does the rest.
I have spoken to my familly about spiritual things several times, and I can understand why it is difficult to overcome something that one grew up with even though it may not be right thing.
Belief becomes a part of who you are, in a sense. So I understand why you get so vile in your discussions. But really I'm not saying anything that is negative to you personally or any religion. But if you are biased and narrow minded, you would feel threatened.
Really have you even thought or wondered how could God, who is Almighty or all powerful, be threatened by mere human being?
Does God need you to defend Him?
What could you add to God who is Perfect?
Is is not our pride or ego which feels hurt or threatened?

I watched the above video about the Buddha's Heart Sutra. I read the Buddha's Dhammapada, which I really liked it. I'm open to reading Hindu scriptures too, and talking about them.
Regligion is constrictive and restrictive, while the Spirit sets you free. I can pray in the Spirit for anyone regardless of whether he/she is a christian, hindu, buddhist, muslim, etc. But if I'm religious then I would feel threatened or even hateful towards those who are of different religion, and thus would be selective in treating others.