Before Seeking in-Depth Knowledge, Start with the Quran

I meet Muslim brothers who tell me all the bad things about a particular scholar. I ask the brother if he can read Surat Al-Fatihah. I find that he cannot even read the Quran properly, but he was able to speak about a scholar of Islam. What kind of Islam is this? When the Companions of the Prophet became Muslims, the first thing they concentrated on was Quran and how to pray.