That seems an odd statement to make.

Why should
he have to find out for himself. He already says he makes judgements based on the actions of those who profess a belief in Islam. That seems perfectly reasonable to me. Let's say I am a fisherman in Central Africa and my buddy is eaten alive by a crococile. Now, on holiday, I see a Nile crocodile, who is insulted by may apparent alarm and states, "Sir, I am a Nile crocodile, the stupid Lake Victoria crocodiles are not true crocodiles. You are ignorant in the way of crocodiles. You need to study the Crocodile Field Manual."
It seems to me the Nile crocodile is the one with the work to do, not the fisherman.