You Will Be Praising a Sinful Act Rather Than Rebuking It

A Christian should not attend a mixed marriage wedding because he or she will be praising a sinful act rather than rebuking it. Some will claim that to attend such a wedding is to show love and acceptance for the sinner, as Jesus did when He drank and ate with sinners. However, there is a major difference between a sinner seeking to learn more about God and wanting to change, and a Christian rejecting counsel and determined to do what God forbids. Jesus admonished Christians to rebuke such individuals.

Luke 17:3 Take heed to yourselves; if your brother sins, rebuke him, and if he repents, forgive him.

1 Timothy 5:20 As for those who persist in sin, rebuke them in the presence of all, so that the rest may stand in fear.

James 4:17 Whoever knows what is right to do and fails to do it, for him it is sin.