Salvation for the Whole World
If by salvation we mean a type of wholeness (i.e., at-one-ment), then the way of Jesus is the only way to salvation, for it's in the Jesus-way (i.e., radical hospitality, refusal to scapegoat, and volitional sacrifice) that humanity finds a path to be at one with itself and with God.
If/when humanity discovers how to be at one with itself, it will find ways to play its role within the world (that plays its role within the universe, that plays its role within God.) Something, isn't it? All these smaller parts so interwoven even into the bigger whole.
Salvation touches upon all things. "If everything is intertwined," as my friend Andre Rabe says, "then every part implicates the whole."
I find it very interesting that what science has to say—the biologists, physicists, chemists, astronomists, on and on—is in harmony with all this at-one stuff; that is, that the universe is an interconnected pattern being formed and reformed by its individual parts (that are less individual and more interdividual).
When we read the sacred text through this "oneness lens," the harmonic overtones ring out everywhere … salvation isn't a state an individual attains, an ultimate destination; salvation is a relational way of becoming for each individual within humanity (within the world, within the universe).
To play a role, we're invited to become one with ourselves and each other.* If there's a way to do this outside of radical hospitality, refusing to scapegoat, and volitional sacrifice, I'm all for it, but I have no idea what that would be!
*One caveat: if you're being coerced, manipulated, or used by someone or some system, I do not think love requires you to be "at one" with them or even be hospitable to them. Love is a type of concurrent energy, in that multiple things can be happening at the same time. In this case, love can be building you up, helping you to draw boundaries, which helps in keeping you from danger. At the same time this love can be serving the person with whom you need to draw boundaries with, in ways you would have never imagined possible.