You may want to research that a little more before you brag about it.
https://www.newenglishreview.org/Ibn_Warraq/Population_and_the_True_Number_of_Converts_to_Islam/
Islam loses as many as it "converts", a fair amount of the "conversions" are due to the above average birthrate and many who do convert - do not stay with the religion for longer than a few years, as they are only doing it as a form of social protest. Thankfully, non-religions such as atheism is growing faster.
https://www.jstor.org/stable/pdf/26351197.pdf
To be clear, no one is saying that ALL converts to Islam become terrorists, but more converts to Islam become violent than do converts to other religions.
^^^ I believe the extremist nature of many of the religion's teachings are to blame - misogyny, hatred of others such as Jews and non-Muslims, hatred of gays, etc. , in addition to other factors. I don't believe you can have explicit teachings - that women are deserving of lesser treatment, non-Muslim women are deserving of even less than that, Jews, gays and everyone else are deserving of death, that "convert or die" is a legitimate thing - and then act surprised when converts act on those beliefs or claim they "misunderstand" the teachings.