Did Matter and Energy Already Exist Before the Big Bang?

Questions about whether matter and energy already existed before the Big Bang, how to respond to a Christian friend who believes Genesis 1 and Genesis 2 describe two separate creation events with two sets of humans, and the source of Moses’ creation information. What do you think of the argument that matter and energy already existed before the Big Bang—that it was compacted by gravity, then the Big Bang happened, then repeat? How would you respond to a Christian friend who believes Genesis 1 and Genesis 2 are two separate creation events with two sets of humans being created? From what source did Moses obtain his creation information?