I have made a list of questions by which you can test the adherence of a person to Islam. These are not the only questions, but these are questions that contradict modern morality. A serious Muslim would never marry anyone who fails this test.

If they answer no then know that they are guilty of disbelief, if they are not ignorant then they are a disbeliever. You should inform them of the correct view, should they continue to answer no then you know that they are not an orthodox Muslim.

1) Do you affirm that it is right and moral for the Muslims to wage war (if the Muslims have the ability) on peaceful disbelievers who refuse to pay the jizya?

2) Do you affirm that it is moral for the Muslims to enslave the women and children of said disbelievers, and execute the pubescent men?

3) Do you afform that it is licit for Muslims to have sex with the slave girls should they be Christian Jewish or Muslim; The one who uses them for this purpose is not blamed and is considered an upright member of society?

4) Do you affirm that it is allowed and not blameworthy for a Muslim to profit from the sale of slaves, like those mentioned before or those born into slavery?

5) Do you affirm that purchasing female slaves for sexual gratification is legal and not something a Muslims is blamed for, rather such a Muslim remains an upright member of society?

6) Do you affirm that it is legal and moral for a person to lawfully marry someone even if there is a big age gap?

7) Do you affirm that a man has a right to sex and a wife denying it makes her an oppressor just as a man denying his wife maintenance makes him an oppressor?

8) Do you affirm that a man can marry multiple women so long as he is just with them, he can marry them purely because he thinks they are cute and without any higher goal?

9) Do you affirm that divorce is in the hand of the male, he can divorce his wife by merely saying "you are divorced"?

Lets be honest most bints would fail this test and if you have any sense you would not marry them. So what should you do? Find a cute Christian or Jewish girl, she can answer no to all of these and the marriage would still be valid.

Additional questions

10) Do you affirm that Islamic law is supreme and abrogated all other laws?

11) Do you confirm that Islamic law cannot be annulled via a democratic process?

12) Do you affirm that the role of the ruler is to implement the law and he has no right to change the law?

13) Do you affirm that those nations that do not rule by Islamic law have no right to exist, whether they be Muslims majority or kafir majority?