Most of those types weren't isolated like Mayweather was. You got to be around a Muslim in jail to convert. I'd die laughing if that happened though
it's been my experience that it's one of two things....either they convert...or come out worse.
i.e...my cousin from the south suburbs...went to a good school. grew up like carlton from the fresh prince...even talked/dressed/looked like him. got arrested and sent to county over some traffic shit...came out a month later hood than a muhfucka claiming vice lords and started slangin. i was laughing my ass off!!!