John 6: 63-65
63 It is the Spirit who gives life; the flesh is of no avail. The words that I have spoken to you are spirit and life. 64 But there are some of you who do not believe.” (For Jesus knew from the beginning who those were who did not believe, and who it was who would betray him.) 65 And he said, “This is why I told you that no one can come to me unless it is granted him by the Father.”

1 Corinthians 12:3
3 Therefore I want you to understand that no one speaking in the Spirit of God ever says “Jesus is accursed!” and no one can say “Jesus is Lord” except in the Holy Spirit.

Matthew 19 23-26
23 And Jesus said to his disciples, “Truly, I say to you, only with difficulty will a rich person enter the kingdom of heaven. 24 Again I tell you, it is easier for a camel to go through the eye of a needle than for a rich person to enter the kingdom of God.” 25 When the disciples heard this, they were greatly astonished, saying, “Who then can be saved?” 26 But Jesus looked at them and said, “With man this is impossible, but with God all things are possible.”

Matthew 22:37-38
And he said to him, “You shall love the Lord your God with all your heart and with all your soul and with all your mind.
This is the great and first commandment.

John 15:10-11
If you keep my commandments, you will abide in my love, just as I have kept my Father’s commandments and abide in his love.
These things I have spoken to you, that my joy may be in you, and that your joy may be full.

John 3:3
Jesus answered him, “Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God.”

Christianity is a supernatural religion of the heart that results in Joy in God. Without a supernatural event it does not exist. Without a heart change full of Joy in God, it is not real. A man must be born again.