The other three gospels don't make that exception. But in any case, that doesn't excuse the others. If a baker bakes a cake for the reception of a wedding where either the bride or groom was divorced for other than fornication, it is a sinful wedding, as stated by Jesus in reference to the 10 Commandments.Unless of course there was a previous marriage that ended in divorce. In which case it's an adulterous, sinful marriage.Even folks who have never heard of the Bible get married. Some ceremonies never mention God at all. Some ceremonies are held in for profit wedding 'chapels' that have no religious affiliation.Perhaps their wedding ceremony was a civil ceremony without religious context..
Even a civil ceremony is a couple getting married under Gods Command.
God himself married Adam and Eve
Genesis 2: 23-24
23 And Adam said, This is now bone of my bones, and flesh of my flesh: she shall be called Woman, because she was taken out of Man.
24 Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.
There was no Churches back then.
Not everyone must believe in Adam and Eve, I sure don't!
You are still married under Gods eyes.
Not necessarily
Jesus Explains Why Divorce is Allowed
Matthew 19:8 He said to them, “Because of your hardness of heart Moses allowed you to divorce your wives, but from the beginning it was not so.
Matthew 19:9 And I say to you: whoever divorces his wife, except for sexual immorality, and marries another, commits adultery.”