How does one have a relationship with God? The same way that Adam did. You walk and talk with Him every day. Of course, Adam sinned and broke that fellowship with God - so that the ONLY way we can have a relationship with God is through Christ Jesus' His Son. Such is not a new concept. It is as old as the Bible itself.
1 Corinthians 1:9
God, who has called you into fellowship with his Son Jesus Christ our Lord, is faithful.
2 Corinthians 13:14
May the grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with you all.
Romans 5:10
For if, when we were God's enemies, we were reconciled to him through the death of his Son, how much more, having been reconciled, shall we be saved through his life!
2 Corinthians 5:18
All this is from God, who reconciled us to himself through Christ and gave us the ministry of reconciliation:
Colossians 1:22
But now he has reconciled you by Christ's physical body through death to present you holy in his sight, without blemish and free from accusation—
John 1:12
But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
Romans 8:15
For you did not receive a spirit that makes you a slave again to fear, but you received the Spirit of sonship. And by him we cry, "Abba, Father."
Galatians 4:6
Because you are sons, God sent the Spirit of his Son into our hearts, the Spirit who calls out, "Abba, Father."
"I once was lost but now am found,
Was blind, but now, I see."
Gee, Blogger, I don't see the word "relationship" anywhere in the passages you quoted. What I do see is definition after definion of what our created purpose is and how we fulfill that.
"'Can a man take fire into his bosom, and his clothes not be burned?' says the wise Solomon. And I say: can he, who has in his heart the Divine fire of the Holy Spirit burning naked, not be set on fire, not shine and glitter and not take on the radiance of the Deity in the degree of his purification and penetration by fire? For penetration by fire follows upon purification of the heart, and again purification of the heart follows upon penetration by fire, that is, inasmuch as the heart is purified, so it receives Divine grace, and again inasmuch as it receives grace, so it is purified. When this is completed (that is, purification of heart and acquisition of grace have attained their fullness and perfection), through grace a man becomes wholly a god." +Symeon the New Theologian