I think that Daz's M3 would make a good Jesus, as far as hair goes... Jeez there are so many! Being that M3 is a Generation 3 figure, I'm sure that you can find something pretty good with a little searching (maybe even a freebie). Check this one out which is designed for Michael 1&2... a combo morphing hair and beard and a venerable Poser classic. From what I've read here and there it can be fit to M3 with a little adjusting of the XYZ.

http://www.daz3d.com/michael-s-morphing-fantasy-beard-w-hair