Religion is about truth. It sounds strange to have to assert such an obvious idea. But in our day it needs saying. For, today, it is quite acceptable for religion to be about community, or for religion to be about cultural identity, but it is unacceptable for religion to be about truth. You see, truth carries with it the notion of its opposite, falsehood. And we are quite squeamish about saying this or that religious doctrine is false, lest we offend this or that religious adherent. For sure, concern to not offend is commendable, but not when it comes at the expense of emasculating the truth.~ Ravi Zacharias International Ministries
And what is truth? Truth is Christ. Jesus said,
"I am the way, and the truth, and the life. No one comes to the Father except through me." (John 14:6) Although many other claims to religion exist, they all are based on some foundation other than Truth personified. Thus, the only true religion can be “Christ”ianity.