You didn't understand his comment.
There are different versions of Islam just like there are different versions of most other religions (e.g. Catholic vs Orthodox Christianity).
Saudi Arabia has a majority of Wahhabi followers. The Wahhabi sect of Islam promote extreme Islam, Shariah, etc..
These Wahhabi followers terrorize fellow Muslims who follow a different sect of Islam... their goal is to purge the world of infidel Islam and to put in Wahhabi Islam which they believe is the true version.
Saudi Arabia, as I said earlier has a majority of Wahhabis. They send these Wahhabi missionaries to other Muslim countries who follow moderate Islam and their goal is to convert the inhabitants to become extremists and in turn try to convert their fellow countrymen into extremists as well.
And just to make it clear, their conversion tactics include bombings, killings, etc.. So it isn't just a knock on the door and asking if someone has 15 minutes to talk about our lord and savior Muhhamed.
Source: my country has these scumbags.