>> father, we do thank you and praise you doubt date >> reporter: prayer is at the heart of darrell foster's ministry. he has ministered to thousands of black men and women who no longer want to be gay. >> have you seen measurable growth within yourself? >> sometimes i don't recognise who a. >> who you are, who you were? yes, yes >> reporter: he sits with james, a man who once was gay. he says thanks to foster's ministry he is strait and married with children. do you feel that people can be born gay? >> well, this might be surprising, but yes, i do. i believe people can be born gay because we are all born in sin. homosexuality is a sin. you can be born in sin. >> reporter: foster has a himself. >> when i was 11 years old and i was playing chase, i chased a male friend. i called him and held him. and a feeling came over me that i almost didn't want to let him go. that, i think was the genesis of my recognition that i had feelings towards other males. >> describe to me the point you realised that within the church, and church's teachings, that this was also looked at as a feel? >> i felt awful