I assure you, there is nothing wrong with my reading comprehension. I find your argument inconsistent because your definition of "dad" requires common genetic material. I know adopted people and people with step-parents who would disagree with that definition. These are not rigid facts, but statements of
personal opinion (just in case reading comprehension is not, shall we say, high in your skillset).
As for that quip about Sharia law, that's absolutely asinine. I have little desire to discuss your prejudices against Islam in a discussion about general prejudices against homosexuals, so let's try to stay on-topic or at least on-tangent here.
So am I correct then that a single gay parent would make the worst possible parent-child relationship you can imagine? Do you believe the sexual orientation of the adoptive parent is fundamentally more important than their race, economic level, health, or any other factor?