You can't join.  You have to be born into God's family, you know, born again.

So how can you be born again? 

1 Peter 1:23 says that you must be born of incorruptible seed by the word of God.

John 1:1 says that Jesus is the Word. You need to be born of Jesus, the incorruptible seed, who is the Word of God.  
 
Romans 10:9 says that if you confess the Lord Jesus with your mouth, and believe in your heart that God has raised him from the dead, you shall be saved.  
 
Will you, just now, confess with your mouth that you have sinned and that you need a Savior for forgiveness and deliverance from your sin? Will you tell Jesus that you will receive Him right now?

Just pray, "Jesus, I receive you and turn my back on all my sin.  I have been wrong.  Please forgive me and give me a new heart.  Please redeem me from my slavery to Satan and set me free from bondage to sin by the power of the blood you shed for me.  Come, Lord Jesus and live in me and let your Light shine out through me."  

That may seem too easy, but it's the only way, and you must remember that committment to Jesus is a committment to serve Him.  That is, it is a committment to listen to His voice and to Obey.  You see, we didn't really have anything to bring to the situation other than a willingness to be reconciled to God.  God will take care of the righteousness part if we will just yield to His Spirit.  
 
Don't miss out now.  
 
It's a wonderful thing to be born again.

The relationship is one of God leading and you following.  He speaks to you and you listen and obey.  That is the exact reason that some people claim to not believe in God.  They are willingly ignorant and refuse to acknowledge God.  They know, intuitively, that the relationship is that of submission to authority.  
 
The true deception of the age is the illusion of freedom.  There is no such thing.  Freedom from God is slavery to Satan.  
 
On the positive side, God is love.  There is no love without God.  There are many counterfeits to love, but if you have ever experienced true love, you have touched God.  God created us to be constantly filled and led by His love.  This is the only place of fulfillment.  The rest of what we call existence is a vapor.  
 
For those who have come to God to know God by the one method that God has provided, belief in Jesus as Savior from slavery to Satan, this is written: "The love of God has been poured out through our hearts through the Holy Spirit that hath been given to us.  That's a bit different from religious forms, isn't it?