Not believing does not equal believing. Maybe you are confusing me not believing something with a belief. Which it isnt.
Kant was primarily a philospher, it even says it in your post*lol What he says here isnt scientific.
There is not empirical evidence of the start of the universe. Big bang is a theory, which would require the belief in that occurrence.
So again, pick one.
You either believe in the big bang, or you bind yourself to current technology which limits you to the truth.
Einstein quotes:
Trust in Causality: "For me the cognitive basis is the trust in an unrestricted causality".
The "Thoughts" of God: He famously remarked, "I want to know how God created this world... I want to know His thoughts, the rest are details".
Order in Nature: Einstein believed that difficulties in scientific prediction arose from a "variety of factors in operation, not because of any lack of order in nature".
All pointing towards stating that every material effect must have an adequate cause.
Would you like more quotes from more scientists aligning with this understanding? I gave you a list of many, but there are more than 50% of scientists following this concept and studying this truth.