He also had a brief role as John The Baptist in another biblical movie. Was it "The Greatest Story Ever Told?"

TIS
Yup...and I know someone who saw that months back, and claims to me that it was surprisingly pretty good, if just too long.
EDIT - Off topic, but I just found out that one of EL CID's fans, ole Marty Scorsese, was one of the people that was able to get that sucker out on DVD. That's awesome.