Salvation is a gift that is made available to those who repent, believe, and confess that Jesus is Lord and that He died and rose from the dead to save mankind. See how it's simply put here in Acts 16:31:

Centuries of salvation-by-works teaching have left people confused about the condition of having eternal life and about the meaning of key New Testament verses. In this book, the authors discuss some of the most important verses, untangling common confusions, and dusting off unwarranted assumptions, in order to discover the original meaning of what was said. Throughout these discussions, they emphasize the amazing grace of God in Christ and the importance of a life of discipleship.