There is only one woman with many faces = it's OK to sleep around?
I'm not saying the film is condoning the above statement. I'm just making a comment on the slyness of the guardian angel (i.e., the devil), who uses the phrase to justify having multiple partners. It's all part of the plan to subtly lead Jesus further from his path.
After Magdalene dies while pregnant with Jesus's child, the false angel turns Jesus's attention to Mary of Bethany: Go ahead and marry / sleep with her. Every woman, while different in appearance, is spiritually your one true love, your Magdalene.
In a later scene, Martha tells Jesus that her sister is away until evening, and beckons him inside the house. For the second time, the angel reminds Jesus that "there is only one woman, but she is with many faces." When Jesus rises and follows Martha, I inferred that Jesus and Martha consummated their relationship.
On closer observation, I find that the false angel was only interested in leading Jesus astray when it came to relations with women. The angel did not or could not make Jesus turn against God. He still remained devout and non-violent; he worked at an honest living; he appeared to be a devoted father; in short, he was still a good man. I think the overriding concern was to derail Jesus's destiny as saviour. In order to do that, the false angel had to exploit Jesus's weakest point -- or his greatest distraction to spiritual life -- and that was his near-equal longing for a family and the bond of a romantic and domestic relationship.