According to Christian scholars Mary was 12 when she had Jesus, why do Christians criticize Muhammad (pbuh)?

u r so right... why do some christans criticize Muhammad(PBUH) and Aisha (PBUH); but cannot criticize the fact that Mary (PBUH) had a son when she was 12. Muslims, hopefully, belive in Mary... but cannot criticze... I mean Muhammad(PBUH) waz mentioned in da bible... so why criticize him???