In a letter written in response to the questions of Eugenio Scalfari, atheist and founder of the Italian Newspaper “La Repubblica,” Pope Francis shares what sets Christianity apart from other religions:
Always in the editorial of July 7, you ask me in addition how to understand the originality of the Christian faith in as much as it is founded on the Incarnation of the Son of God, in regard to other faiths that gravitate instead around the absolute transcendence of God.
The originality, I would say, lies precisely in the fact that the faith makes us participate, in Jesus, in the relationship that He has with God who is Abba and, in this light, the relationship that He has with all other men, including enemies, in the sign of love. In other words, Jesus’ offspring, as presented by the Christian faith, is not revealed to mark an insurmountable separation between Jesus and all others: but to tell us that, in Him, we are all called to be children of the one Father and brothers among ourselves. The singularity of Jesus is for communication, not for exclusion.
Christianity is unique because faith in Jesus involves us in the life of God who exists as love, as a triune community. God became human in Jesus (see Pope Francis’ discussion of the Incarnation just prior to this quote in the original article) to reveal the universality of God’s love which extends to all people and all created things. When Pope Francis says “communication,” I think what he means is something like “the creation of community” — not “communication” as in talking or conveying information in one way or another. The Trinity, then, God as community of diversity, of otherness, in perfectly equal, mutual, and reciprocal relations which opens up to include all creation, is what makes Christianity unique.
This section of the letter was the most profound for me, but the entire letter is worth a read.