Our role is to believe in Him. (Mark 16:16, John 3:15) That's it. Faith, not works....
No. By the Father’s mercy and grace, through Jesus Christ the Savior, nothing is required for the salvation of His elect. Everything including their faith is given to them from salvation.
Were it otherwise, it would mean that Jesus Christ isn't the Savior.
[2Pe 1:1-3 KJV]
1 Simon Peter, a servant and an apostle of Jesus Christ, to them that have obtained like precious faith with us through the righteousness of God and our Saviour Jesus Christ:
2 Grace and peace be multiplied unto you through the knowledge of God, and of Jesus our Lord,
3 According as his divine power hath given unto us all things that [pertain] unto life and godliness, through the knowledge of him that hath called us to glory and virtue: