Well, by your works do show what type of person you are. Now are they following what Jesus says? Do they show the love of God to others? Now if they were truly Christian, then there would be a great change in their lives, and these people are not showing that, so they not really Christian, certainly their actions do not match what they say they are. Now this is a personal question that you can answer by PM if you want, but has your wife ever once told you that you are dying in your sins and that you need to put your trust in Christ? If she has not done that once, the I seriously doubt that she is a Christian. I know I am making a judgement call, but I am just following the advice if Jesus. Matthew 7:21-23 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.