He didn't say he would reincarnate someday into a future life. He said three days after being buried he would show himself alive to those who saw his crucifixion. On that third day, Jesus' tomb was found empty and many people testified that they saw him alive again. He now offers eternal life to us. It's a two-way relationship.
Many religions focus on a person's spiritual efforts.
Christianity is a two-way interaction between you and God. He welcomes us to go to him. The Lord is near to all who call upon him, to all who call upon him in truth. 9 You can communicate with God, who will answer your prayer, give you greater peace and joy, provide direction, show you his love, and transform your life. It will not mean that life will become perfect and free of problems.