Peter Kreeft lists 12 reasons why Christianity is unique in an article on The Integrated Catholic Life website. Here is a quote that is absolutely true:

If you confess at a fashionable cocktail party that you are plotting to overthrow the government, or that you are a PLO terrorist or a KGB spy, or that you molest porcupines or bite bats’ heads off, you will soon attract a buzzing, fascinated, sympathetic circle of listeners. But if you confess that you believe that Jesus is the Christ, the Son of the living God, you will find yourself suddenly alone, with a distinct chill in the air.

His #1 discussion point is: “All religions are the same, deep down.” And it goes from there. Very meaty, interesting discussion of the topic.