It doesn’t take a doctorate though. It just takes some logic. For example, if God is composed of parts, who put those parts together? But that would mean then that God isn’t God, and then there is another Being who put His parts together, therefore that thing is God, but then that leads to an infinite regress if there is no simple being. And if there is an infinite regress, there is no First Cause that started it all, therefore no second cause, then no third, and so on. So there must be a First Cause that is absolutely simple and not composed of parts.
It doesn’t take a degree and its not ridiculous. Calling it that is honestly offensive. And no one is laughing. But no one has ever said taht understanding the deep things of God would be easy…if they did they lied. God is infinite, we are finite. Therefore, we will never be able to understand everything about Him, but will spend forever learning more and more about Him.
For example: explain how a just and lawful God could send His only innocent Son to die for lawbreakers? How much grace is that? And how hard is that to understand?