The First Step to Membership is Salvation:

Admit that you are a Sinner and in need of salvation.
“For all have sinned and come short of the glory God.” (Romans 3:23)
Believe that Jesus Christ died for your sins and was raised from the dead.
“For God so loved the world that He gave His only begotten son, that whosoever believes in Him should not perish, but have everlasting life.” (John 3:16)
Ask God to save you and make you a member of His family.
“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.” (John 1:12)