Gaude, I definitely agree with your earlier post, especially the bit about Christians being supposed to treat everyone as if they were all Christs (I was hungry and you did not feed me etc). I also think that actually that was entirely the point, I think Jesus wasn't trying to set up Christianity as we know it today at all - that all came afterwards. His message was actually so radical that even now, if a messenger or prophet came saying the same things couched so that we as modern humans could understand it, we still wouldn't really be able to follow it. We would hear and then as soon as we were processing the information the understanding would start to fall away.
Your point about Sufism and the Christ within was really what I was getting at with my bit about the divinity within - although I know it annoys Christians when I say that. I think the mystics in each religion is the place to look - I find extraordinary similarities between the writings of St Teresa of Avila, St John of the Cross, Julian of Norwich and the writings of many of the medieval Sufi saints.
I think there is one truth that is sort of incomprehensible to our little human souls, and we extrapolate all kinds of things in our quest to "get it".
Personally I try to approach it from the point of view that essentially common sense dictates that all church/religious leader lead opinion and orthodoxy is a built up fossilised layer upon layer accretion of individual opinions over a few thousand years, rather than "the truth" but (hopefully) the heart of it is in the right place.
I then think to myself, since I am outside any religion, what does everything I know about the world and my experience of goodness and love and joy in nature and humanity tell me is "the truth", the point of my existence? What information can I glean from what others on the path have learned before me? I try to follow that, I try to follow my heart, and the hearts of others gone before.
I'm not claiming that I have the answer (greater minds than mine have struggled with that one!) but I do think that the answer definitely does not lie in any one religion alone.