Of course you can. Just laws in a free society only prohibit actions that interfere with another's life and liberty. Unjust laws interfere with adult individuals' own private free choice that does not interfere with other's freedom.
Abortion is murder, clearly interfering with the life of the unborn and, therefore, should be prohibited.
Sodomy done in private between consenting adults, though deviant and reprehensible behavior, does not interfere with another's freedom and, therefore, should not be illegal
I’m not, for this thread, discussing if homosexuality ought to be illegal. Should someone who believes homosexuality is evil and repulsive in God’s eyes be forced to celebrate homosexuality in his public life?
Can we only condemn sin as sin in private homes and churches, or can we act on our beliefs in the public sphere?
And remember - the pro-choice folks completely reject your belief that “Abortion is murder”. They liken it to removing a tumor. In fact, from a religious viewpoint, the Bible condemns homosexuality in strong terms and is largely silent on abortion.
Please notice I am NOT in any way supporting abortion. But from a religious freedom viewpoint, the religious argument against homosexuality is more explicit in the Bible, along with some other religions.