The big bang was not the singularity, but we call singularity the moment before the big bang began, where current theoretical physics break. A break doesn't mean non-psysical, just outside of commonly understood physics. Even time is considered to only be meaningful when the big bang begins.
Humans love delusions that allow them to deny the fact that we die. Before the scientific method and continuing, there are endless philosophical currents. Many people are stuck into these seemingly forever, without much access to reality.
Today neurology and its success in identifying an increasing number of neurological-experience correlates, suggest that conventional physics, biology and neurology will still continue to help us understand the brain.
In relation to consciousness and psychology, a number of impressions may really be delusions up to some point. Our thought processes also allow us to entertain convenient fantasies and concepts that don't need to be limited by physics. It doesn't mean that what allows that is non-physical.
This post features god of the gaps fallacy: behind what the poster doesn't understand must absolutely be the spiritual and divine intention. There are claims of evidence of the divine, without being able to provide any whatsoever.