Yes they do. Not only "wrong and sinful" but actually from Satan. They are taught "he who is not WITH me is against me."
(Edit) I should clarify, the more conservative Christians believe this. (The ones that dominate the landscape in the USA). Moderate and Liberal Christians are accepting of other religions.
Most Christians believe that their way is the only true way to god, therefore, they believe that only through their teaching is the only way to god. What god would be so blatantly, within himself dispose of such in cred
There will be elements of truth in every world faith, which we expect as every man and woman is made in God's image. But as Christians we must believe that where Christianity differs from the other faiths, Christianity is right and all the others are wrong. CS Lewis says it's like a maths problem. You may get lots of different answers to the sum, and some will be more right than others, but only one will be exactly right.
Yes. Christianity is a very intolerant religion. They believe that it's Jesus's way or else. In fact most of the Abrahamic religions are intolerant. Jews believe they are the chosen ones of god. Meaning I guess everyone else sucks or is going to hell, and I believe that Islam has this tenant as well. The Eastern religions and various Prue-Christian pagan religions were more tolerant.