We are only scratching the surface of genetics and epigenetics and no one in the industry pretends to have the tools to make statements like '8% of the variance in sexual orientation is determined by genetic factor'.
We know that e.g. dementia has a strong genetic component and have still failed to identify it despite knowing with certainty that component is there. We know faces are almost entirely determined by genetics but are still far off from being able to accurately predict a face from dna. We have a long way to go.
You're misappropriating studies that you don't understand to support a personal viewpoint that has no basis in the facts.