have you read some of their beliefs? Totally unbiblical. Sex in Heaven making children? We can be like God, Jesus and Satan are brothers, etc...
Matthew 5:16
16 Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.
So God is our Father in heaven. Did he not father us? He is the father of our spirits.
Hebrews 12:9
9 Furthermore we have had fathers of our flesh which corrected us, and we gave them reverence: shall we not much rather be in subjection unto the Father of spirits, and live?
How do you know that God does not have a wife or that he procreates through the process of sex? Show me in the bible where that teaching is false.
Matthew 18:14
14 Even so it is not the will of your Father which is in heaven, that one of these little ones should perish.
You don't think we can be like God yet God commands us to be like him.
Matthew 5:48
48 Be ye therefore perfect, even as your Father which is in heaven is perfect.
And the bible says that we can be like him.
1 John 3:2
2 Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.
John 17:20-23
20 Neither pray I for these alone, but for them also which shall believe on me through their word;
21 That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me.
22 And the glory which thou gavest me I have given them; that they may be one, even as we are one:
23 I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me.
Regarding Satan, the bible says:
Isaiah 14:12
12 How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations!
Revelation 12:7-10
7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,
8 And prevailed not; neither was their place found any more in heaven.
9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
10 And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night.
Although the bible doesn't declare Satan to have been a son of God at one time, he was certainly in heaven and rebelled against the Father and was cast down to earth. Only through continuing revelation do we know that he was at one time a son of God. He was once known as a Son of the Morning.