Could not Allah create a couple like Adam and Eve instead of marrying of the children of Adam, namely the brothers and the sisters with each other?

Could not Allah create a couple like Adam and Eve instead of marrying of the children of Adam, namely the brothers and the sisters with each other?

Dear Brother / Sister,

Allah, certainly could create thousands of Adams and Eves as He has created a distinct Adam and Eve/ a former father and mother for every kind of animals/ living beings which have hundred thousands of species.
He could apply the same method here, too. However, the Divine wisdom adjudicated in that way and has created a single Adam and Eve. Certainly, this reality has much wisdom. One of them may be the concept of oneness (tawheed). Allah has created the human beings, who He has selected as a caliph to Himself on the earth, in a way that would bear the symbol of the oneness of Himself. That symbol is the oneness of Adam who is the first human. According to the rule “A single act can arise only from a single doer”, the existence of Adam who is a single human is the indicator of the oneness of his Creator, Allah. Likewise, the nucleus of the cosmic mess of the universe is a single substance. Today, some experts say that is the hydrogen atom.    
Moreover, after having seen such negative effects of racism in the community of humans although they all come from the same Adam and Eve, it is difficult even to imagine the seriousness of the situation in case that human beings would come into existence from different Adams and Eves. Therefore, the Divine ordinance has found it suitable to create them from a single family.
On the other hand, something’s being halal (permissible) or haram (prohibited) depends on Allah’s order. If He lets it, it becomes halal, and if He prohibits it, it becomes haram. As He is the Owner of the properties, we are to believe in Him and obey Him. That is a requirement of faith and submission.

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