Christianity is the opposite of religion. In the various religions people offer sacrifices to a god. In Christianity the exact opposite happens: God offers a sacrifice to the people, even His Son. God the Father offers His Son as a sacrifice to people to show them that He truly loves them, in order to reconcile them with Himself. The Apostle Paul says this in a wonderful way: "We are therefore Christ’s ambassadors, as though God were making His appeal through us. We implore you on Christ’s behalf: Be reconciled to God" (2 Cor. 5:20). What religion can present something like this? This is completely contrary to every religion. God is appealing to us to be reconciled with Him. All this is like an erotic story. Christ comes to earth, He tells everyone "I love you", humanity is indifferent, and Christ in order to "prove" His great love for man...commits suicide! Saint Nicholas Cabasilas likens Christ to a manic lover Who in the end, to prove His erotic love sacrifices His life. This is Christianity. It is something completely different from religions, it is not legalism. True Christianity is a true and lasting revolution, not a religion. The objectives of the revolution of Christianity are so wide, so great, with the result that this revolution will end only with the Second Coming. Whoever views Christianity as something static, as something that lacks movement, does not understand anything.
Source: From an anonymous lecture presented in the lecture of Hieromonk Makarios of Marouda on Mount Athos delivered on March 30, 2014. Translated by John Sanidopoulos.