There is an alternative here that no one has addressed.
There are many other galaxies and planets in those galaxies so why would it not be possible for God to move a portion of the human population to another planet and simply start again?
It was God's original purpose for humankind to fill the earth and subdue it. What comes afterwards is never mentioned. It does seem cruel to create humans with an emotional capacity for love and sexual attractiveness to each other and then take it away.
As for the scripture about "them being like the angels in heaven", in my opinion Jesus is talking about the ones with a heavenly calling. Despite the fact that the ones Jesus were talking to didn't believe in a heavenly resirrection seems irrelevant. They also didn't believe Jesus was the Messiah. jesus told them "you know neither the scriptures nor the power of God, you are very much mistaken." So the implication here is that despite what they thought they knew, the realization was very different.
I disagree with the notion of man being created soley in God's image. God is a spirit. Being made in God's image seems to be more like a commentary on mental awareness and emotions and not so much a physical one.
However there is this:
Genesis 1:27 " 27
So God created mankind in his own image, in the image of God he created them; male and female he created them."
The scripture says that both male and female were created in God's image. So it either means God has both male and female genitalia (which seems odd considering God is a spirit) or it's has to do with mental capacity. However it seems likely that God could be both male and female. A hermaphrodite, since these ones do exist on earth.
Consider also the different plant life, flowers and such certain colors and emotions which are labeled uniquely feminine by our human society. Of course that may be because humans tend to group things into categories and separate ourselves from one another by those categories. Since God created females, it stands to reason that God also contains the same exact qualities as women, for if God doesn't then where did the emotional aspects of women (being more in touch with their feelings than males and having a more nurturing predisposition when it comes to children tham men) come from?
Consider also that Jesus is called "the firstborn of all creation".
Colossians 1:15 -19 "He is the image of the invisible God, the firstborn over all creation. 16 For by him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities; all things were created by him and for him. 17 He is before all things, and in him all things hold together. 18 And he is the head of the body, the church; he is the beginning and the firstborn from among the dead, so that in everything he might have the supremacy. 19F or God was pleased to have all his fullness dwell in him, 20and through him to reconcile to himself all things, whether things on earth or things in heaven, by making peace through his blood, shed on the cross. "
Notice that Jesus is called the first born and not the first created. So the implication is that God gave birth to Jesus and didn't merely create him in the same way Adam was created. Jesus is literally made from God in the most strictest sense, the same way children are made from their own parents genetic material.
God being referred to in the masculine sense seems to be merely a product of the culture that Moses was living in when he wrote the Torah. Moses' society in which he lived was already patriarchal before the advent of the Law and so God simply referred to himself/herself in a way that already fit the model that was already in place. For God to refer to himself/herself as both sexes would likely cause divisions and confusion, for there might be some who would question the validity of the "headship" principal for this reason. So God picked a patriarchal way of referring to himself not only because Adam was created first, but because of the society already in existence. But all this is basically irrelevant as Jesus and the Bible in many places says God is a spirit, having no flesh and bones and hence no sexual organs. One could therefore surmise that God is both sexes in a mental capacity since God is the originator of all knowledge and emotional states that we humans find ourselves endowed with.