Since I am not a believer in unicorns, I will take the liberty of removing reference to it in your quotes and substitute "God" in bracket, since this is who I am speaking about.....
Here are some important questions:
We know the universe is expanding infinitely, there are billions of planets. [God] being the creator of the universe, why of all the planets that exist and the possible life forms that are more ancient than human beings, why is [God’s] only son a human?
If you read my previous posts I have explained this in detail....FWIW.
Why would [God] choose a human and not some other life form like an amoeba, germ, virus, cell or atom? What is so important about being a human among all the possible creatures in the universe why choose a human being? Hmm, maybe because [God] creates humans in his image, that's the reason.
If you understand why humans were created with God's qualities and moral attributes, you will see why he appointed them to be caretakers as his representatives on this earth. The vastness of the universe and the speck that is our earth helps us to understand the scope of God's intentions when he created it. I believe we are in the very early stages of a much bigger project. This is where God irons out all the 'bugs' that the misuse of free will would introduce. We still have a thousand years to go before God can begin implementing the rest of his purpose for creation.
Why would he choose son instead of daugther? What is so important being a son? Hmm, maybe because son is stronger than daughter, daughter is weak or have other responsibility Because [God] says so.
God created the man as head of his family.....his wife was to be a complement of him, their roles combining to create harmony and balance in the family unit. She was not created to compete for leadership, but to provide what her husband did not...and vice versa in raising well balanced children. We all know how important role models are....today they are all messed up and people are confused and not happy because there is no balance.
Sons were important in Jewish society because sons often had to care for their mother and siblings when a family head died...and they died earlier than women apparently in Bible times (even as they often do today). There were many widows, including Mary where Jesus, as the firstborn, was obligated to care for her. When he was dying, he entrusted her care to the apostle John, even though he had younger brothers...they were not yet believers. He considered her spiritual welfare to be more important than just her physical care.
Why would he choose a son who likes to drink wine instead a son who prefer apple juice? What is so important about wine? Hmm, maybe that's because wine is very holy, wine is holy because [God] says so.
Why would he choose a son who prefer grape wine instead a son who prefer whisky? What is so important about grape wine?
Why would he choose a son who live in village A instead a son who live in village B?
What is so important about village B?
It was prophesied hundreds of years before he was born, that he would be born in "Bethlehem Ephrathah", which is the same town that King David was born in. It was part of his credentials as Messiah that he would be born in that specific town....and considering that Mary and Joseph were not residents of that place but journeyed there due to a decree of Caesar to get registered, God saw to it that the prophesy was fulfilled.
Why would he choose a son who likes to collecting stamps instead a son who prefer jogging? What is so important about collecting stamps?
Now you are just being ridiculous....
Be careful who you mock. (Galatians 6:7)