Buddhism believe life cycle.If you are good people and when you die you will become human again in another life(bad karma).But if you are bad people you will become dog,cat etc in another life(good karma).If you are good people and have no sins you will get Nirvana(peace).But in Christianity Jesus Christ died for us and whoever believe in him will have eternal life.In eternal life you will live peaceful and joyful.Siddhartha Gautama prophesied about loving GOD. John 3:16 “For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.” Rom 5:6-8 “You see, at just the right time, when we were still powerless, Christ died for the ungodly. Very rarely will anyone die for a righteous person, though for a good person someone might possibly dare to die. But God demonstrates his own love for us in this: While we were still sinners, Christ died for us.” Romans 6:1-4 “What shall we say, then? Shall we go on sinning so that grace may increase? By no means! We are those who have died to sin; how can we live in it any longer? Or don’t you know that all of us who were baptized into Christ Jesus were baptized into his death? We were therefore buried with him through baptism into death in order that, just as Christ was raised from the dead through the glory of the Father, we too may live a new life.”
John 14:6 “Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through me.”