Geshtinnanna, it does not matter what "I" believe. I am not an authority on the issue. And this thread is about cats being carnivores and not about homosexuality, OK?
Whether or not something like that has any genetic ties, however, does not honestly matter. Just as genetic predispositions to, say, anger are not an excuse for murder, so any other genetic predisposition is not an excuse for something known to be wrong.
However let's talk about the cats, OK? Since we have been informed that cats lack the active gene for a sweet tooth, this means that the gene was once probably active. That means that cats, like dogs and bears and such, were probably quite content eating plants that had a high protein/amino acid content. This is supporting evidence for the accuracy of the Bible which says that all the large animals, at least, were vegetarians at the beginning. And this directly contradicts evolution and what it claims about felines.