I have noticed this about the Ruby on Rails world. After working in Rails jobs at 5 different companies in 2 cities, I've met and worked with scores of other Rails devs, but I've only known only one other Rails dev who was even Muslim, and no one who was Salafi. Some would be disheartened by this, but I take it as a source of pride.
I was not born into a Muslim family, but I embraced it later in life. So I love Islam a great deal and consider it to be the best thing that has ever happened to me. But I do not get into debates about religion or God with co-workers or on the internet, because I don't feel it's appropriate. When I'm at work, I'm not there to proselytize; I'm there to make great software and earn money. And on the internet, it's just too pointless. If I'm talking to you about Islam, then I'm not doing it for fun -- I'm doing it because I want you to become Muslim. I find it very unlikely that someone who never believed in God in their life would start believing just because some stranger on the internet talked them into it. Rather, the end result is always a flame war, and that doesn't really encourage good manners.