There many loci that have dozens of different alleles and more across the human population. A single diploid pair of individuals can possess a maximum of four alleles per locus. Where have all those other alleles come from if not via mutation?
Many novel alleles have come from mutations. However, the functionally novel human alleles that have been produced by random genetic mutations (outside of Mendelian or epigenetic variation) have not produced functional advantages over the original gene pool of options. Rather, such mutations have resulted in an overall functional detriment to the human gene pool.
This is known as downhill evolution, not the other way around.
For your contention to be correct, either Adam or Eve would have had to have had sickle-cell trait, thus enabling their African descendents to have resistance to malaria. Oh, oops, that’s a detrimental mutation (unless, of course, you live in Africa where malaria runs rampant). This is the kind of quandary that happens repeatedly with your kind of reasoning about genetics.
Sickle-cell is a classic example of a mutation that disrupts the original function of a system (hemoglobin in this case) which results in a survival benefit in certain environments. However, this type of survival benefit is like cutting off your arms to avoid a monster that only eats people with arms. In this particular case, the malaria parasite is less able to survive in an oxygen-poor environment. This, produces a survival advantage for those humans with defective hemoglobin funationality - a survival adventage that is produced via a loss of pre-existing functionality is no way to fight genome degeneration over time. Again, such mutations that are based on a loss of original functinality are very easy to achieve in short order, but will eventually add up to result in genomic meltdown and eventual extinction of a species. They simply aren’t helpful over the long haul because there are only so many pre-existing functions you can lose before you have nothing more to lose (i.e., you’re dead).
Again, what do you do with the fact that the known detrimental mutation rate is so high that the human gene pool is degenerating rapidly over time? How does this reality square with your arguments here?
The same cannot be said for same-sex marriage, there is no moral harm you can identify, and since there is no moral harm, why prohibit it, except because it makes you uncomfortable, or it doesn’t reach some ideal you have determined to be important?
I don’t think same-sex marriage should be legally prohibited. That being said, I don’t think one can honesly argue that the Bible supports such a marriage as being the ideal for humanity. Rather, the Bible clearly supports only a marriage between one man and one woman as being the ideal situation before God. I’m not the one making such claims here. It’s the Bible making such claims…
Even were this to be true, how does that address same-sex marriage. No one is implying that same-sex marriage is the same as heterosexual marriage. Just because something does not meet some specified ideal, does not mean that alternative approaches or variation should not be allowed. If there is nothing morally wrong with same-sex marriage, why not allow it, especially if it can help gays live more fulfilled and sexually responsible lives? If you are uncomfortable with it, don’t get married to a man yourself, but why prohibit others. Heterosexua marriages loses nothing by also allowing same-sex marriage.
From the Biblical perspective, an effort to do something that God doesn’t not consider ideal for you or me to do is defined as “sin” - a form of rebellion against what God has in mind for you and for me. So, we should always point people toward God’s ideals for humanity.
Again, that being said, no civil law should be enacted to enforce such “Christian Ideals” onto society at large. Everyone should be free to choose to align themselves with such ideals, or not, at will.
However, within the church, we should not promote, or hire anyone who actively subverts, any known biblical ideals for the Christian life.