I have a "nutshell" summary of what I believe to be the difference between Biblical Christianity and every other religion:

There are many religions, but only one faith.

In every other religion I know of (including Roman Catholicism), salvation (or enlightenment, nirvana, whatever) is achieved by good works. So too in Biblical Christianity, except that the good works that save us are not our own, but Another's, credited to our account so to speak, and realized only by God-given faith.

Welcome to the Highway! May your sojourn here be blessed,

-R