There is one God, who is both the Creator and the Sustainer of the universe, and who therefore is God of heaven and God of earth.
There are two things that make a life of heaven for us—the good that we do out of love and the truth we believe. This life is given to us by God, and nothing of it comes from ourselves. For this reason, the primary duty of a church is to acknowledge God, believe in God, and love him.
Those born within the Christian church should acknowledge the Lord, his divine nature, and his human nature and believe in him and love him, because all salvation comes from the Lord. That is what the Lord tells us in John:
Those who believe in the Son have eternal life. Those who do not believe in the Son will not see life; instead, the wrath of God abides on them. (John 3:36)
And in the same Gospel,
This is the will of the one who sent me, that all those who see the Son and believe in him will have eternal life, and I will raise them up on the last day. (John 6:40)
Jesus said, “I am the resurrection and the life. Even if they die, those who believe in me will live; and anyone who lives and believes in me will never die.” (John 11:25, 26)
This means that people within the church who do not acknowledge the Lord and his divine nature cannot be joined to God, and therefore their portion will not be among angels in heaven. You see, no one can be joined to God except by the Lord and in the Lord.
The Lord teaches in John that no one can be joined to God except by the Lord:
No one has ever seen God. The only-begotten Son, who is close to the Father’s heart, has made him visible. (John 1:18)
You have never heard the Father’s voice or seen what he looks like. (John 5:37)
No one knows the Father except the Son, and those to whom the Son wills to reveal him. (Matthew 11:27)
I am the way, the truth, and the life. No one comes to the Father except through me. (John 14:6)
The reason no one can be joined to God except in the Lord is that the Father is in him and they are one, as he teaches us, again in John:
If you know me you also know my Father. Those who see me see the Father. Philip, do you not believe that I am in the Father and the Father is in me? Believe me that I am in the Father and the Father is in me. (John 14:7–11)
The Father and I are one. . . . [Believe in my works,] so that you may know and believe that I am in the Father and the Father is in me. (John 10:30, 38)
from New Jerusalem, Sections 280-283