It is not faith that saves. The faith God gives is evidence of being saved. We have the cart before the horse. The thief next to Jesus was different to the other criminal. He was concerned with Jesus suffering for sins He did not commit. He had compassion for Jesus. He showed a good heart. God judged the heart and mind. They passed. Jesus could then say to him, I will see you in paradise. The thief was then likely given a revelation of who Jesus was. It is this spiritual revelation of Jesus that is Christian faith. Only faith because it is spiritual. But it is as real to us as gravity. Hence, anyone proposing we need to grow in faith does not understand faith. Anyone proposing we need to grow in Christian faith, does not understand Christian faith. Peter knew Jesus was more then a man. Peter had faith that Jesus was able to help him to walk on water. Yet, even he needed Christian faith. Matt 16:16-17 And Simon Peter answered and said, Thou art the Christ, the Son of the living God. 17 And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven. This revelation of who Jesus is, is given to all Christians. Christians are humans who have passed His judgement and are now adopted. Evidenced by them calling Jesus Lord. Just as the thief did. That is why we have scripture saying this: John 14:16 I am the way and the truth and the life, nobody comes to the Father but through me. And John 3:16 ''whosoever believes He is Lord''. 1 Cor 12:3 'Nobody says Jesus is Lord except by the Holy Spirit''. Your statement is like saying ''dead love is no love''. What love is dead? What faith is dead? If I have no works, my faith in grey aliens may be alive but my Christian faith is dead. Grow what faith? We can grow in faith in God as daily we better grasp Him. Look at Abraham conversing with Him over Sodom. Abraham asked questions of God he was not certain of. God revealed Himself to be exceedingly good. Abraham's faith in God being good, increased. But faith in God's existence and Jesus being Lord (IE Christian faith), how do you grow in that? You either know it or you don't. As scripture says ''My sheep hear my voice''. It does not say after removing all doubt and fear, my sheep hear my voice. Or after a level of faith is built up, my sheep hear my voice. It is all nonsensical statements. We either are His sheep who hear His voice or we are not.