As if anything beyond faith could exist. This is a warning full of love. Keep yourselves separate from them. It is an apostasy from Christ. Gospel of Grace Christians who put Christianity on the same plane as other religions and find them all equally satisfying show that they have not understood the uniqueness of Christianity and its essence, which is grace.
Human religions have their way of preaching salvation.
Buddha, for example, show how to free oneself from pain. He died and rose again for us, and he has thereby given us not only the example, but also the grace and the ability to follow his example. The Christian Gospel is the Gospel of grace. These are just some of the things that nowadays tend to obscure the Gospel. Another problem comes from the legacy of our history.