2. The Lord is God of Heaven
First and foremost, we need to know who the God of heaven is, since everything else depends on this. Throughout the whole of heaven, no one is acknowledged as God of heaven except the Lord. Angels say what he himself taught, namely that he is one with the Father, that the Father is in him and he in the Father, that anyone who sees him sees the Father, and that everything holy emanates from him (John 10:30, 38; 14:9-11, 16; 16:13-15). I have often talked with angels about this, and their consistent testimony has been that in heaven they cannot divide the Divine into three because they both know and perceive that the Divine is one and that this "one" is in the Lord. They have also told me that when people arrive from earth with the idea of three divine beings they cannot be admitted to heaven. This is because their thinking vacillates between one opinion and the other, and in heaven they are not allowed to think "three" and say "one." 1
In heaven people actually speak directly from their thought, so that we have there a kind of thoughtful speech or audible thought. This means that if people have divided the Divine into three in the world and held a separate image of each one without gathering and focusing these three into one, they cannot be accepted. In heaven, there is a communication of all thoughts, so if people arrive who think "three" and say "one," they are recognized immediately for what they are and are sent away.
Still, it needs to be realized that in the other life any people who have not put "good" in one compartment and "true" in another - who have not separated faith from love - accept the heavenly concept of the Lord as God of the universe once they have been taught. It is different, though, with people who have separated their faith from their lives, that is, who have not lived by the guiding principles of true faith.
1. In the other life, Christians have been examined to find out what kind of concept of God they had, and it has turned out that they had a concept of three gods: 2329, 5256, 10736, 10738, 10821. On the recognition in heaven of a trinity within the Lord: 14-15, 1729, 2005, 5256, 9303.
(References: John 14:10-11)