Historical Events in the Quran

I just recently gave up on faith, and I still have a few questions that I never really thought about when I was Muslim. For example, why does no secular source mention the HUGE historical events like Abraha attempting to destroy the Kaaba? The inscriptions from that time didn’t mention any of that happening. Also, why does no one mention the splitting of the sea? Or the flood that Noah overcame? I understand that these events are purely myth, but has any muslim “scholar“ tried to explain why there’s no historical/geological evidence?