Best of luck with humanitarian work though there are few companies that specialise in it and jobs are hard to find and by no means guaranteed to take you where you sound like you want to go - I mean it is hard to choose where you may work. It will take luck and perseverance.
As far as the religious side is concerned if you're of the mindset that thinks it is OK to go and ram your religion down the throats of poor benighted black heathens because your book is the right one and theirs isn't...
Is there a worse demonstration of cultural vandalism and racial bigotry than this?