Why I do believe in god? (Scientifically speaking)

In physics, the basic rules are “You cannot create something with nothing” and “Cause and Effect”. So the question is “Where we came from?” I’m talking about our universe, the big bang, and cause and effect.

Effect = Everything
Cause = Big Bang
Effect = Big Bang
Cause = Singularity
Effect = Singularity
Cause = ?

Here we can see cause and effect. Singularity, the cause of the big bang, where big bang is the prime cause of creation. But where did the singularity come from? We can’t trace back before the singularity. What about before Time? No one in the scientific world can answer and so the most basic question “Where we came from” left unanswered. That is why, I believe in GOD, the Supreme Being or the creator.