The first part Genesis 3:22 states that the Lord God said, “Behold, the man is become one of us, to know good and evil: …”

Now first and foremost it is important to recognize that God did not say, “Man is God”, but God said that “the man is become one of us” The reference to the One God here as “us” refers to the trinity of God in three persons, who is still One God, much like in the same manner, God said, “Let us make man in our own image.” Second, it is important for us to know, the context in which man had become as God, as well. Man had become as God, in the context of knowing good and evil. When God created man (and for that matter all of creation), God declared that it was all good. Man was created in God’s own image, innocent without blemish as a living soul (Genesis 2:7). Even though he was naked, he felt no shame, because of his uprightness. Now man did not know what evil was or its wages until after he sinned – when he felt the shame of his nakedness, that made him want to hide from God.

God knew both good and evil. He knew what was good for he declared his creation as good. God knew what was evil and its effect of being separated from God, for one of his own created angels, Lucifer rebelled against him with iniquity (sin/evil) in his heart, that led to his downfall from the presence of God (Ezekiel 28; Isaiah 14). Lucifer becomes the adversary (Satan) of God and he knew what it meant to be evil for he personified it.

Man did not know evil, for he was created upright (Ecclesiastes 7:29) but the serpent deceived the woman and through her the man into knowing what evil is. Like God, now man knew both good (fellowship with God) and evil (separated from God for unrighteousness can have no communion with Holiness).

Points to ponder:
Because of man’s disobedience/sin, God had to say, “Behold, the man is become one of us, to know good and evil: …” Because of man’s disobedience/sin, God had to also say, “Behold, I have to become as one of man, to undo the evil and its wages (which is the need to hide from God, and be eternally separated to him by second death), with good.” (Philippians 2:7-8). For when the fulness of time had come, God sent forth his Son (Jesus Christ) to be made of a woman (God made as man), to redeem man, so that man can be made upright again as children of God (Galatians 4:4). Have you accepted the Lord Jesus Christ, the Only begotten Son of God, made of a woman, so that you could receive the adoptions as a child of God, innocent without blemish?

Genesis 3:22 (KJV)
22 And the Lord God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever:

Ecclesiastes 7:29 (KJV)
29 Lo, this only have I found, that God hath made man upright; but they have sought out many inventions.

Galatians 4:4-5 (KJV)
4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
5 To redeem them that were under the law, that we might receive the adoption of sons.

Philippians 2:5-9 (KJV)
5 Let this mind be in you, which was also in Christ Jesus:
6 Who, being in the form of God, thought it not robbery to be equal with God:
7 But made himself of no reputation, and took upon him the form of a servant, and was made in the likeness of men:
8 And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross.
9 Wherefore God also hath highly exalted him, and given him a name which is above every name: