Christianity did not spread because of its message; it spread because of what Christians did.
If you were asked to summarize the Good News of Jesus in one word, what would it be? For me, I think “love” would be at the top of my list. Words like victory, resurrection, and restoration would also be pretty high on the list.
The early church summarized the Gospel message with a much different word: suffering.
Throughout history, God has called His people to be different; to live in a way contrary to what the world thinks is normal.
In Judaism, full forgiveness on Yom Kippur only comes after one has sought forgiveness from those they have wronged. Jesus establishes the same standard for his discples.