Abortion: The turkey you ate for Thanksgiving did more than a fetus.
Proof in God: Mind sharing?
Homosexuality: This is the same thing as racism, or prejudice against religion, etc. End of story.
So does the value of a person depend on what that person does? Or is the value of a person based on the fact that a person's a person, no matter how small?
And regarding the other thing, what in the world are you talking about?