Hello, I would say that a wedding is a spiritual when it is performed before God in a church or outside with a minister since people want to prove genuineness and purity by involving God in their marriage, Ecclesiastes 4:9-12. They seek God's blessing and approval for the unit to succeed. In having the seal of approval for God the union should be genuine and pure by following the Laws of God and not breaching. But a warning is still necessary in Christian requirements by trying to pass the union off as if it were in agreement with the Laws of God this is neither genuine nor pure in God's eye, Matthew 5:48. If a breach of God's Laws is broken, then this will surely be exposed you will not be able to hide it. What information in the Bible shows that God is interested in the moral integrity of marriage?
1 Thessalonians 4:3-8
Names of God Bible
3 It is God’s will that you keep away from sexual sin as a mark of your devotion to him. 4 Each of you should know that finding a husband or wife for yourself is to be done in a holy and honorable way, 5 not in the passionate, lustful way of people who don’t know God. 6 No one should take advantage of or exploit other believers that way. The Lord is the one who punishes people for all these things. We’ve already told you and warned you about this. 7 God didn’t call us to be sexually immoral but to be holy. 8 Therefore, whoever rejects this order is not rejecting human authority but God, who gives you his Holy Spirit.
