Bud's religion is not false, Chuck. I'll lay may neck on the chopping block, for the one, true religion before I kiss a koran.
In pointing out the errors of the Orthodox he included an error he also happily and proudly indulges. If he can claim that the Orthodox practice a false religion, then he is free to admit that he, too, shares in their apostacy. You should talk to him about that. I bet that he would include you as hellbound as well.