Brock's is truly a Muslim, because of his dark skin, like Muslen. and Brock is polygamist, what religion defends polygamy ? Muslim religion my friends. What is Brock's dream? Besides of being a PKM breeder, having a Harem full of beautifull girls. So I conclude that Brock is muslim, lol
When his after all the pretty girls of the anime, is his simply expressing the will of his religion.