A: In a one word answer: No. They are not all the same and Christianity certainly differs in many ways.
First, there is the aspect of Jesus offering eternal life by forgiving our sins and granting us salvation through His life. No other religion offers this. They advise you to do good deeds in order to work your way into heaven. God does not ask us to do anything in return, only to believe that Jesus is the Christ.
To read further and understand this concept from far wiser words, please go to this site and read from John Piper.
[Answered by KJT]
