I really don't like syncretists. (fixed)
One of Christianity's big points is that salvation can only come through God, specifically the form of Jesus of Nazareth. To try to save yourself without God is essentially denying God. Buddhism explicitly makes the statement that humans can discover the truth and thereby save themselves, without teachers or gods - and goes so far as to say that gods can't really help with enlightenment. Syncretists would have you believe that both religions are simultaneously correct, describing different perspectives of the same truth as the various blind men are describing the same elephant. Similarly, Mohammed was the last prophet... there just happen to be many other prophets (J. Smith, Baha'u'llah) of God who came later. It's okay in that it doesn't say that any religion is wrong, it just recognizes that the people who say that that religion is wrong are also correct.
It's doublethink and compartmentalization of beliefs at a massive level under the banner of tolerance.
I'm a few posts late for this, but I'd just like to point out that the idea that Christianity demands you be saved "through Jesus" is only one interpretation. When Jesus says "I am the Way, the Truth, and the Light; no man comes to the Father but by me," he could just as easily have been saying "What I am is the way... no man comes to the Father but by being what I am." It's a matter of how you read the language. It sort of works that way in English, and I suspect that interpretation would work even better in whatever language the passage was written in.
As to syncretism - I think all religions are true in that they are similar, and they are similar in that people everywhere are similarly stupid and superstitious.
Also the premise of the OP is completely false: a Discordian would generally not give two shits about charging admission -- we'd leave that to the Subgenii.