Does Christianity promote close mindedness?

I hate to say this because I'm Christian but I think it does. Like in church they tell us not to ociate with "the world" or "worldly things." I play guitar and they teach me that music was originally intended to praise God, so basically I should only play that type of music. They also teach me that the bible is 100% right and anything that goes against it is Antichrist. Like the book of Mormon, or the Koran. Also, when a lady in our church said she doesn't believe that Jesus is the only way because some people like in Islamic countries never had a fair chance to believe in Jesus compared to us my preacher said she's wrong and Jesus is the only way. But I agree with her, what if I were born in an Islamic country where 99% of the population is Muslim, there is no doubt I too would be Muslim.