I found some old news about the movie
http://blogs.indiewire.com/shadowandact/fox-shelves-kasi-lemmons-black-nativity-trouble-casting-black-male-lead-lets-help-them
Seems the movie has had problems getting made. The budget is set at $10Million, it will easily make its money back.
But wow! all the name "black" actors passed. Give a pat on the back to Forest.