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Jesus told us to do two things: Love the Lord our God with all our hearts, minds, souls, and love our neighbors as ourselves. You don’t have to be a Christian to do these two things, do you?
Jesus said that no one can come to the Father except through the Son. Paul said that if we confess that Jesus is Lord, and believe that God raised him from the dead, we would be saved. I don't see the option to believe anything else in there.