Moses
As with many other biblical figures, outside the periphery of its own religion, it’s hard to provide concrete evidence that specific figures actually lived in the world today. As a result of the vague time frame presented by the bible, scientists have questioned whether someone like Moses actually existed. The parting of the red sea can be seen as an act of God, or as a naturally occurring force, depending on the person you are talking to.
Muhammad
It’s uncommon for anybody to question the existence of Muhammad, especially as he is often noted as one of the most prominent and successful religious figures in the history of the world. Some historians do lean into the idea that he may not have existed, mostly due to not having enough hard evidence to go by. As with all the religious leaders we’ve mentioned, there will always be differences of beliefs and opinions in a multicultural world, each of which holds fair value in their own right.