I think it is easier to deny the legitimacy of other religious experiences, rather than keep one's heart and mind open to the possibility that God, through his/her great abilities, can make they own belief system true while simulataneously doing the same for different faiths as well. Too often I here people say "God can do things beyond our comprehention," yet deny God is able to do this. It presents a position more rooted in personal ego, pride and the need to be right at the expence of all others who differ, than an expression of the a true, just and all powerful God. IMO.
p.s. I realize there is bound to be some reply in opposition to my position which quotes scriptures in support thereof. But before being tempted to do so, keep in mind that other good, informed Christians have already considered those verses and have come to conclusions that side with my contentions. (I.e. Progressive Christianity.) So before going after me, perhaps you might consider reconciling your own house first. Just a thought.