Why would my stance on this matter change from religion to religion?

I have researched the Muslim faith and know that the marriage of young children in it's history is widely accepted as fact.

I will admit I have little knowledge of the Jewish faith but if what you say is true, then yes, If they believed God told them it was ok at one point in history surely they should believe it now as well. I'm not really sure why you asked me this, I thought I made that pretty clear.