What makes Christianity totally different from all other religions is that it is not about self improvement. It is about the Living God who sent His only Son to die and take our sins upon Himself on the cross of Calvary. No other religion does that.
Every other religion involves some type of self improvement through different stages giving the principle that man can solve his own spiritual problems. No other religion causes a complete transformation in a person to change them totally into another person. We call this Christian conversion.
No other religion has their gods talking with and having personal fellowship with their worshipers, or being in the god's own family, as Christianity having the Living God as our Father and His Son as our brother. Other religions have their gods high above their worshipers with no personal contact, while the Christian believer is seated at the right hand of God, blessed with every spiritual blessing that God can give. This is given to the Christian believer as a gift, while in other religions one has to work their way up through different stages and reincarnations to get to that same point, which they never do.