Although the process itself is not yet well understood there is little doubt that the basic sexual desires we will have as an adult are imprinted on us in early childhood. Imprinted traits can be either positive or negative. Which gender, if either, we find sexually attractive is the result of positive imprinting meaning that we are imprinted in a way that makes us attracted to something. Homosexuality is an example of positive imprinting.
Negative imprinting is where we are imprinted with an aversion to something. Our psycho-sexual portrait is the result of both positive and negative imprinting. Some limited research has been done that shows heterosexual males can be negatively imprinted with traits observed in the father leading them to find these traits undesirable in a mate.
As homosexuality gains wider public acceptance it is tempting to accuse those that oppose open homosexuality as harboring feelings that were learned from their bigotted upbringing or are a result of wrongful thinking; similar to some of the accusations leveled at homosexuals. While a person's upbringing will influence how they express their feelings, these feelings themselves may be rooted in something that goes deeper. They could be imprinted, meaning there is no psychological "cure" for them - they will be permanent and are every bit as natural as any other feelings we have.
The point is: I think it is important to realize that both sides have deep seated emotions tied to this issue that did not originate from psychological, philosophical, or religious learnings. It is no more "wrong" to consider homosexuality repulsive as it is to consider it desirable. Both are naturally occuring feelings that won't go away. Once this is recognized I believe we have a better chance dealing with human rights issues.