Exactly. Remove the religious element altogether and homosexuality is still an abomination under “natural law” alone. Biologically it makes no sense. Physically it makes no sense. It is, by definition, abnormal — an aberration that many people find naturally repugnant. No one has to be taught to be nauseated by the sight of two homos tongue-wrestling, anymore than anyone has to be taught to cringe at the smell of feces. The repulsion is innate.
You guys nailed it. Do not need to be a Bible reader to figure it out.