Faith in stupid things leads to stupid results, faith in wise things leads to good results.

The reason fundamentalism has a bad name is because it's rather common for fundamentalists to believe in stupid things, such as: "Our way is the only true path. Those who don't follow it are doomed."

Exclusivity and intolerance are not indicative of spiritual wisdom. Tolerance toward differing faiths is. The spiritually wise do not attempt to convert other people.