peace,
Some says Marriage between believing men, and women from the Book is clearly sanctioned by the Quran.
but I think this is only applicable for that time i.e. for marriages that are fixed(given the bridal due) before the revelation of Qur'an.
here's the translation of 5:5 as I understand the verse,
"This day (all) the good things are made lawful for you; and the food of those who have been given the Book is lawful for you and your food is lawful for them; and the chaste women from among the believers and the chaste women from among those who have been given the Book before you; when you have given them their bridal due, marrying not fornicating nor taking them as secret lovers/concubines; and whoever denies faith, his work indeed is of no account, and in the hereafter he shall be one of the losers"
And the Qur'an says,
"O you who believe, do not take the Jews and the Nazarenes/Christians as allies, for they are allies to one another; and whoever takes them as such from among you is one of them. God does not guide the wicked people." [5:51]
5:82
You will find the people with the greatest animosity towards those who believe are the Jews and those who are polytheists; and you will find the closest in affection to those who believe are those who said: "We are Nazarenes/Christians;" that is because among them are Priests and Monks, and they are not arrogant.
5:83
And if they hear what was sent down to the messenger you see their eyes flooding with tears, for what they have known as the truth, they say: "Our Lord, we believe, so record us with the witnesses."
So as they believed in the Qur'an, they will have Swalat, Fasting, Hajj etc. right? i.e. they are no more Nazarenes/Christians.
5:84
"And why should we not believe in God and what has come to us of the truth? And we yearn that our Lord admits us with the righteous people."
Thus, 24:32, 4:25, 2:221 etc. suggests marry only believers.