How is Christianity different from other religions?
I would say that one difference between Christianity and some other religions is that Christians, in contrast to Jews or Muslims, for example, believe that one of the keys to eternal life is belief that Jesus Christ was born as a result of the Virgin Mary being impregnated by the Holy Spirit.
Also, in contrast to Jews or Muslims, Christians believe in a Trinity, which is comprised of the Father (God), Son (Jesus), and Holy Spirit being one and the same entity.
Christians also believe that God, in the form of Jesus Christ, came to this earth in human form, was put to death on a cross, was buried, was raised from the dead, and then ascended into Heaven. Jews, Muslims, and Hindus do not share this belief.
Speaking of Hindus, in contrast to this religious tradition, Christians do not believe in reincarnation.
For Christians, belief that Jesus Christ was the Messiah and that he died so that all who lived after could be forgiven of their sins is a central pillar of the religion. Unlike some other religions, Christians believe that salvation depends on God's grace rather than observance of a specific set of rules or regulations.
As John 3:16 states, "God loved the world so much that he gave his only son so that whoever believes in him may not perish but may have eternal life" (my literal translation). So, for Christians, acquisition of eternal life depends on believing in Jesus Christ as God's only son.
Basically... Christians wear red hats. Muslims wear green hats. Jews wear black hats, etc, etc.
Christianity is a religion. Religions all attempt to do the same things. They explain why you were created. They tell you what to believe. They tell you what is 'right' and 'wrong'. They ask for your money and they want to control you.
Some religions are more peaceful than others, Buddhism for example. Some religions are more greedy than others, Scientology for example. Some religions are more unbelievable than others, Rastafarianism and The Flying Spaghetti Monster for examples. But ultimately they are all 'religious products' competing for religious customers. Fundamentally they have the same goals.