I`ve been re-thinking this question
Biggest impact on humans
and have come to the conclusion that belief in a GOD has been the biggest impact on humans and not just Jesus or Mohammad or Buddha or Vishnu or any other prophet in the world ,but it is simply a belief in a GOD.
Sure Christians of all persuasions have been responsible for the deaths of millions in the name of GOD or Jesus but so have all the other religions throughout history killed and slaughtered in the name of this or that particular GOD that they worship.
In my previous post I singled out followers of Jesus Christ of slaughtering millions of people in his name and really all they were doing was following in the footsteps of Jesus father Jehovah who himself was responsible for the death of millions of people up until the time of Jesus Christ
Like Father like Son ?
However ALL GOD`s have been responsible for billions of death in the name of religion whether "true" or "false"
it doesn`t matter billions of people died and that is the Biggest impact "GOD" has had on humans.