I am hard core atheist so I don't add any mythology to the Jesus we hear about. I believe that at that time, like in any generation, there would be revolutionaries, teachers and philosophers and someone like Jesus would have existed.
Do I believe that someone like him could have been nailed to the cross? Yes. This was someone who probably rejected many of the Mosaic teachings in the Torah like the stoning for adulterers and taught not to seek revenge.
Take away the mythology and strip the book down to the man, it's a good story even if none of it was true because it teaches good behaviour towards others. The Islamic Jesus doesn't have that intention.
I don't advocate the Christian Jesus but I reject the Islamic Jesus as an insult to the story, because it teaches that it is ok to nail someone else to the cross as your punishment.
Elegant post.