We have a shared reality with others on this planet. This is self-evident. It's not a simulation. If I cut myself, I bleed. People are born and died all the time. Thus, we enter and exit this shared reality.
Consciousness arises as an emergent property of brains. This is the current leading hypothesis supported by evidence.
The Big Bang is the current accepted model of how the universe got here. The elements are manufactured in the cores of stars, and get propagated through supernova explosions. This is the stuff we are made of.
Science already has most or at least enough answers to give us a pretty clear picture of what's going on.
Cheers.