Schvitzer 

Yes, the point was he's religious but knows nothing about the world of Kiruv.

Assuming you are Jewish and believe in God, I will tell you there is such a thing as the oral Torah (law). The point of the joke is that it is written yet called oral law. Oral Torah is halach lemoshe mesinai. Halacha passed down generations from then. Halacha not actually written straight out in the Torah. Gemara and mishna is oral law. For example, we know take an etrog on succos and to sit in a succa. But it doesn't go into details. Oral law tells us how the etrog needs to look to be kosher and details about the succa of how tall and materials and how many walls it needs to be. Same with all the halachos of shabbos. Torah says there are 4 methods of killing One of which is stoning. Do you know the process of stoning? It is very complicated. And oral law explains it. That is what gemara and mishna is and what all those English halacha seforim and shulchan aruch is based from