When you said "the lead actor was gay", I thought you were talking about "End of the Spear". That would have been weird.
The lead in End of the Spear is gay.
Yes, Chad Allen is. There have been all sorts of threads around FR with people agonizing over seeing it for that reason. Here's a quick tidbit from another site:
http://www.bpnews.net/bpnews.asp?ID=22496
Someone posted a Christianity Today article here on FR about the "dilemma" of hiring a gay actor for the part.