Numbers 25:1 And Israel abode in Shittim, and the people began to commit whoredom with the daughters of Moab. 2 And they called the people unto the sacrifices of their gods: and the people did eat, and bowed down to their gods. 3 And Israel joined himself unto Baal-peor: and the anger of the Lord was kindled against Israel.
When Balaam invited the Hebrews to the worship of the Moabites they went, and by their presence they showed their support for what was transpiring, even if they did not actually bow down to idols, for one’s presence can stand as a silent witness, in favor of an action, which, in their innermost souls, they might not necessarily agree with.
When God gave to the human family, the institution of marriage, He did not stipulate that those who get married will have to be believers. The stipulation is that marriage must be conducted between one man and one woman. That includes the Muslim man, the Hindu man, the Buddhist man the Christian man, or an atheist man.
God originally ordained marriage between one man and his female wife and thus, even if one were to be unequally yoked in that original format, the parents, and family members can still attend. They might not agree with the union, but because it falls within the Scriptural stipulation of one man to his female wife, your attendance can pass the smell test.
Genesis 2: 22 And the rib, which the Lord God had taken from man, made he a woman, and brought her unto the man. 24 Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh. 25 And they were both naked, the man and his wife, and were not ashamed.
May God add His blessing to the study of His word. “Good night” and God bless!