Why don't Islamic Scholars & Apologists Leave Islam ?

Top Islamic Academic Scholars and Apologists , why do they stay in Faith. They Face serious questions and arguments than us , they know Islam and Quran much. They made to think about Islam more than us. They Debate Atheist, Ex Muslims and Other Faiths. They Deep Dive into Islamic Academic Studies, History, Facts and Everything. They had to face serious and hard arguments and questions and debates.

After all this why do they don't leave Islam ? Why do they still keep their Faiths? Even though they know Islam way more much than us, even after they face and come across many errors, doubts, arguments, mistakes and much more. Still they are firm to their Faiths, Why ?

For like us , neither we know much about Islam and neither we come across such difficult doubts,questions, arguments and so on as compared to them. Yet we leave and they stay . Why ? And what does that tells us ?