Are Muslims the most dimwitted of the Abrahamic followers if they're the farthest religion down the line?

All of the Abrahamic faiths have been plagiarized from past supersitious beliefs. Abraham lied and probably concocted some ideals he heard from here and there, added to some word-of-mouth folktales. Christianity plagiarized from Jewish beliefs and probably had some Greek myth influences, and Islam emerged by plagiarizing Jewish and Christian beliefs. So basically the people farthest down the line of fabricated religions have to be either the most gullible or dimwitted or historically uneducated. Like that telephone game, the last person to receive the communicated message is the most clueless, or in this case willfully ignorant, wouldn't you say? And do you think the stupidity and gullibility of adherents will have to increase for each current subdivision from Islam and Christianity?