"There are lots of questions which I can ask regarding other faith like Christianity…… which really startle me…. But I did not want to ask…… because I don’t want to hurt other faith."

If you have questions and you don't understand something, ASK! Trust me, you will not offend (at least not the people I know!).

Your words are perhaps the most perfect example of why the issue of criticism of religion is one that is fraught with misunderstanding and complexity.