The Bible prohibits activities that are harmful to one’s health. For example, it banned eating shellfish back when this was a dangerous activity. It also bans homosexual intercourse also known as Sodomy because this is an unhealthy activity as explained in the video below from Gutsense:
The Libertarian Party should not support this unhealthy practice by endorsing homosexual marriage. It should get out of the marriage business completely. That is the true libertarian position.