Abortion is a sin. You're killing children. Plain and simple.
Homosexuality is no different from any other kind of love. In this case, such Christians are out of line, as they are being unloving to people who simply love a different type of person than them.
In the first case, the sin is deplorable, but you should strive to love the person anyway. They're often in pain and regret, and don't need more judgment heaped on.
In the second case, there's something you should know.
The word "homosexuality" didn't appear in the Bible until 1946. That is, we had a series of vague terms, that people revised to suit their agenda. Yes, as surely as homosexuals try to suit their agenda, the fundamentalists made the Bible say stuff like this to suit their bias.
Oh sure, there's a counter argument, that they were essentially saying the same thing. But were they? This is not a given.
Genesis 1-2 (Creation Account)
Genesis 19:1-9 (Sodom Account)
Leviticus 18:22, 20:13 (Holiness Code)
Romans 1:24-27 (Letter of Paul)
1 Corinthians 6:9 (Letter of Paul)
1 Timothy 1:10 (Letter of Paul)
In the Genesis story, we have a story indeed where we came from, male and female, but it is at no point a command to only love male and female. It's not written this way but rather as an assertion that marriage is an act of love.
In the case of Sodom, the actual crime was rape. It was not the simple act of being homosexual. It clearly said "let them come out so we may know them."
Leviticus says "You shall not lie down with a man as a woman." Let's talk about something. In Jewish culture there was a clear patriarchy, male was dominant and female was submissive. It does not directly say "You shall not lie down with another man as a man," it says that. That is, you are not to be a dominant partner with another man. They are talking about
rape! The thing that people do in prison to other men, against their will holding them down and molesting them. This is what this law is about!
What about the Letters to Paul? Well, context, again is everything. They are talking in context of lust, orgies, prostitution, and adultery. Sexual immorality.
Even if homosexuality was the issue, a Christian should love sinner and hate the sin, as before with abortion. But as I pointed out, this isn't cut and dry.
I'm wary of such laws. For public employees, yes, but private citizens should be able to refuse services against their conscience. Otherwise, we live in an authoritarian culture, and I don't want that.