Great thread!
I was on the fence for a while, (growing up christian, yet seeing the truth of Zen buddhism, etc.) - re: reincarnation.
I am now firmly over it. (blog post about original sin and reincarnation)- What convinced me, was a book by Edgar Cacye
(which is since out of print: I think the name is "Edgar Cayce on Reincarnation")
which talks about the many readings he did for people (referencing past lives)as well as early church history that definitely points to political reasons for getting rid of the concept of reincarnation (which was not necessarily uncommon in the early church)
He was a Christian minister and clarvoiant, the most notable clairvoiant in the 20th century, with over 14,000 personal readings for people)
Official site of Edgar Cayce's A.R.E. - Association for Research and Enlightenment
I would say that his understanding/view of the universe is the closest I've come to what I've seen/experienced to be true (beyond just Christianity, or any one "Eastern" religion.
and also re: "Jesus dying for your sins" - I lean towards something like what
the first post mentioned - a "karmic switch" of sorts - and/or the idea that grace, is more powerful then Karma (though it's an aspect of it as well) -
I yet, though, have found anything specifically about a certain view of his death (for all of our sins) that has really "clicked" with me yet.