Honestly, the main reason MOSman doesn't work as a Jesus metaphor is that Jesus was more than just crucifixes and being the son of God. I say this as an atheist who roomed with a guy in a religious studies class, but Jesus was a fascinating person. He was an outspoken rebel who constantly preached his message, helped and lived among the sick and poor, and defied the government whenever possible. One time, he met a guy who was possessed and treated like a pariah, and exorcised hundreds of demons from him, and when the guy asked him if there was anything he could do, Jesus just told him to spread the word.
I could go on, but my point is that Jesus was a guy who had a very specific message and constantly spoke out about it. MOSman has no real message and never really speaks out about anything - best shown by the fact that, when he works in news, he does the sports beat.
His dad taught him to hide and I think that informs a lot of his personality.