Perfectly normal people who do not have normal sex drives will do some un normal things. In their mind I would think, they believe its as normal as any other marriage. Their minds can be trained to believe a lie about life, marriage and sex, as it is meant to be.
SIN is the system that brings in the belief that God and the Bible is not the means whereby we make our decisions about living, life, marriage and sex. The natural mind is blinded to those things that are spiritual in natural. SIN I believe is the DNA of the nature of man. Within the nature of man is the gene principle that is natural for the mind to be against what God says is right or wrong. Our very being is naturally set against the truths that God has set forth in the Bible. You don't have to be a moral bad person to have this DNA of sin within you. It is in every human person ever born. The truth is every person has a negative desire to be in obediences with just about any law of God or man. Few want to obey the laws of their parents, their government and God's. Its natural to want to go 65 mph rather than the law of 55 mph. Its in the natural of a person. Its natural for the youngest child to disobey what his parents wish for them to do. Babies cry often because they are not getting what they want. Children throw a fit in K Mart when they can not buy a toy of their choice. Its natural, its in the DNA of the nature.
So when they become an adult, they see nothing wrong with doing what they have always desired, if it seems right for them to do, its right for them to do. Its natural for them to see nothing wrong with same sex marriage.
The probem is SIN, its in every person. And of course you don't see your behaviour as SIN.
To solve the probem of SIN is to have a born again change of nature. There needs to be a born again experience. And only through the work of Jesus Christ can a person under go this born again change of nature.
Only Jesus Christ can made the difference in the mind and nature of the person who has a the mindset of set in rebellion against the laws of mankind and God.
And no, the photo above is not from Union Mills, I don't believe my wife, Charity or her sister Debbie would honor a cake as such. I need to ask.