Children of the devil are not children of God.
Mormonism teaches that their god only allows his children in the CK. The rest are outside in some other kingdom.
The theology of The Church of Jesus Christ of Latter-day Saints teach all are children of God--as to their spirit:
Hebrews 12:9---King James Version
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?
Ephesians 4:4-6---King James Version
4 There is one body, and one Spirit, even as ye are called in one hope of your calling;
5 One Lord, one faith, one baptism,
6
One God and Father of all, who is above all, and through all, and in you all.
Only those who obey God, and do His will-- enter into His kingdom:
Matthew 7:19-21---King James Version
19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
20 Wherefore by their fruits ye shall know them.
21
Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.