If the truth is outrageous to you, then what does that say about you?

If Muhammad is the perfect example of a man and a source of law for all time, and if he “consummates” his marriage to a 9 year old girl when he was 54 and sanctions wife-beating in Koran 4:34, what does that say about Islam?

That’s knowledge. All of this is extensively elaborated upon in the hadith, especially Bukhari, among the most reliable.

Speaking of research.