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From my personal islamic view: the Christians loved him so much (and still do) that they raised him to be divine. The recognized him, followed him and try to remember him all the time. Perhaps the divinity believes about Jesus was the failure of the test?
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From the subjective reality in which I live, I'd say Christianity is just another open door. There may well be other doors open that lead to God, but I have no knowledge of them. The universe is so vast that I do not think I am capable of exploring its boundless depths.
In my subject reality, walkers of all faiths each have their own place in the story God is writing. Jews have their place. Muslims have their place and likewise for Christians.
The way I see it, Christians aligning themselves to Christ and their devotion to his ways are not a failure of the test, but rather a realisation of their own unique place in God's agenda. Christians have no intention of idolising Jesus, but are simply on a journey to seek, find and discover God. It may well be true that Jesus is not God. But maybe the gist of the Christianity's message is that in order to find and understand God we must think of Jesus as God for a while, so that when we finally find God, because we knew what we were looking for, we are sure we have found what we sought.
Just as the door of Christianity needs to be seen as an open door for those who want to appreciate its meaning, Christians need to be open to the possibility of other open doors as well. Insiders are not to think as outsiders as mistaken, nor are outsiders to think of insiders as mistaken. The failure of the test to me, instead, is to fail to realise that Christianity, along with its Jesus figure, was the "saving grace" of a group of people who desperately needed it/him and that the Christianity/Jesus paradigm came specifically for those people and not the rest of the world.
Whether or not Jesus has meaning for the rest of the world is a different matter. It may be that there was a different message for those people. Maybe that was what Islam was for. Who knows? Did Jesus have a different message for different groups of people? Should we call that the Islam/Jesus/Mohammed paradigm?
It might sound a bit crude to say this, but maybe Christianity is for Christians, Islam for Muslims and Judaism is for Jews -- and vice versa -- Christians for Christianity, Jews for Judaism and Muslims for Islam. Everyone belongs to something and fits into some kind of picture. We weren't all supposed to belong to the same tribe.
Within our own subjective realities, we see, based on our knowledge and experience, what we understand to be important. As life progresses and as we learn and discover more about the world around us, this may change.
People who have never known Christianity should not be required to appreciate its meaning. One cannot value what one has never known. In that sense the concepts of Christianity will only have a chance of becoming valid once its concepts pass into the scope of one's subjective reality. Outside of that scope it has no value, authority or application. But even when it comes into our scope of reality, it is our choice to embrace it.
Christianity is only important, and only has value and application because I
know about it. I only belong to it because I have chosen to value it and make it a part of my life.
So far as Judaism and Islam are concerned, the same principle could apply.
I'd say it does matter, but it's a question of how it matters and what it means in terms of "mattering."