God said, Let Us [Father, Son, and Holy Spirit] make mankind in Our image, after Our likeness, and let them have complete authority over the fish of the sea, the birds of the air, the [tame] beasts, and over all of the earth, and over everything that creeps upon the earth. 27 So God created man in His own image, in the image and likeness of God He created him; male and female He created them. 28 And God blessed them and said to them, Be fruitful, multiply, and fill the earth, and subdue it [using all its vast resources in the service of God and man]; and have dominion over the fish of the sea, the birds of the air, and over every living creature that moves upon the earth. Genesis 1:26-28 AMP

Almighty God – Father, Son, and Holy Spirit – Creator of heaven and earth, created man in His image and likeness. He created them male and female. Both the male and the female, together, are created in the likeness of God. There is not one who is inferior to the other, but rather, they are complementary to one another.

Now the Lord God said, It is not good (sufficient, satisfactory) that the man should be alone; I will make him a helper meet (suitable, adapted, complementary) for him. 19 And out of the ground the Lord God formed every [wild] beast and living creature of the field and every bird of the air and brought them to Adam to see what he would call them; and whatever Adam called every living creature, that was its name. 20 And Adam gave names to all the livestock and to the birds of the air and to every [wild] beast of the field; but for Adam there was not found a helper meet (suitable, adapted, complementary) for him. 21 And the Lord God caused a deep sleep to fall upon Adam; and while he slept, He took one of his ribs or a part of his side and closed up the [place with] flesh. 22 And the rib or part of his side which the Lord God had taken from the man He built up and made into a woman, and He brought her to the man. 23 Then Adam said, This [creature] is now bone of my bones and flesh of my flesh; she shall be called Woman, because she was taken out of a man. 24 Therefore a man shall leave his father and his mother and shall become united and cleave to his wife, and they shall become one flesh. 25 And the man and his wife were both naked and were not embarrassed or ashamed in each other’s presence.
Genesis 2:18-25 AMP

God first created one being, called Adam. But He said, “It is not good, satisfactory, or acceptable that the man should be alone. I will make him a helper – a mate – who is suitable, adapted and complementary for him.” He made Adam fall into a deep sleep and out of his rib – his side – he formed Eve. The Hebrew word, used to describe how God created Eve is different from the word used to describe how He created Adam. It literally means “built” or “skillfully formed”. God skillfully formed a mate for Adam, who would be specially adapted to him and complementary to him in every way. Eve was especially and specifically designed to be Adam’s complementary opposite – his counterpart. She would be suitable for him, intellectually, morally, and physically. He needed her; he could not do without her. Indeed, without her, he did not only lack companionship, but it would be impossible for him to be fruitful, or multiply, or replenish the earth!

Adam said, “This woman is now bone of my bones and flesh of my flesh.” God took some things out of Adam and put them in Eve; He left some things in Adam that He didn’t put in Eve. They need each other. God created them to desire each other – to desire the oneness of their unity. Woman is said not to have been taken out of man’s head to be lorded over by him, nor from his feet to be trampled on by him, but from his side to be equal with him, from under his arm to be protected by him, and from near his heart to be loved by him. This is God’s plan for a husband and wife!

He replied, Have you never read that He Who made them from the beginning made them male and female, 5 And said, For this reason a man shall leave his father and mother and shall be united firmly (joined inseparably) to his wife, and the two shall become one flesh? 6 So they are no longer two, but one flesh. What therefore God has joined together, let not man put asunder (separate).  Matthew 19:4-6 AMP

But from the beginning of creation God made them male and female. 7 For this reason a man shall leave [behind] his father and his mother and be joined to his wife and cleave closely to her permanently, 8 And the two shall become one flesh, so that they are no longer two, but one flesh. 9 What therefore God has united (joined together), let not man separate or divide.
Mark 10:6-9 AMP

For this reason a man shall leave his father and his mother and shall be joined to his wife, and the two shall become one flesh.  Ephesians 5:31 AMP

God gave marriage as a special gift to Adam and Eve – they were created perfectly and complementary for each other. God ordained marriage – marriage is not a man-made thing – it was not brought about by culture, neither is it just for convenience. Marriage was instituted by God and involves three basic aspects: (1) the man leaves his parents and, publicly promises himself to his wife; (2) husband and wife are joined together by their commitment to each other – by taking responsibility for each other’s welfare and loving their mate above all others; (3) the two become one flesh in the intimacy and commitment of the sexual union that is reserved for marriage. Strong, healthy marriages include all three of these aspects.

Throughout the Bible, God treats this special partnership very seriously and if we are married, or plan to marry, then we should as well. Marriage requires commitment – are you willing to make that commitment that makes the two of you one? The goal in marriage should be much more than friendship; the goal of marriage should be oneness.