it is important for husband and wife to be equally yoked
Exactly. My sister and her husband are not, and though they love each other, it's caused a strain in their marriage since their children were born.
I agree - unfortunately, many people just don’t get what that means... But it is about faith.
A person with a saving faith in Jesus Christ married to someone who believes in the Satanic religion of Islam is not evenly yoked.
But as I have no idea about the true faith (if any) of either in this couple, I will defer to them and wish them a long and happy marriage. I hope they both become real believers in Jesus Christ.