Muslim men marrying christians and jews is *allowed* however by no means is it encouraged. Let it be known that according to Islam it is more fit that believing men marry believing women. So sisters,..you shouldn't feel like you are in competition with christian women,..if there are sisters available Muslim men shouldn't entertain the thought of marrying Christians in my opinion.
If a muslim deviates from the Quran he would be kafir. Similarly the christians and Jews have deviated from their scriptures hence they are no longer people of the book but kafirs. Muslims cannot marry them.
O you who believe! when believing women come to you flying, then examine them; Allah knows best their faith;
then if you find them to be believing women*, do not send them back to the unbelievers, neither are these (women) lawful for them, nor are those (men) lawful for them, and give them what they have spent; and no blame attaches to you in marrying them when you give them their dowries; and hold not to the ties of marriage of unbelieving women, and ask for what you have spent, and let them ask for what they have spent. That is Allah's judgment; He judges between you, and Allah is Knowing, Wise. S. 60:10 Shakir
* to believe in their scriptures and not deny the Oneness of Allah and Muhammed (PBUH)as the Messenger of Allah.
AND DO NOT
many women who ascribe divinity to aught beside God ere they attain to [true] belief: for any believing bondwoman [of God] is certainly better than a woman who ascribes divinity to aught beside God, even though she please you greatly. And do not give your women in marriage to men who ascribe divinity to aught beside God ere they attain to [true] belief: for- any believing bondman [of God] is certainly better than a man who ascribes divinity to aught beside God, even though he please you greatly. [Such as] these invite unto the fire, whereas God invites unto paradise, and unto [the achievement of] forgiveness by His leave; and He makes clear His messages unto mankind, so that they might bear them in mind. Muhammad Asad.
And do not marry the idolatresses until they believe, and certainly a believing maid is better than an idolatress woman, even though she should please you; and do not give (believing women) in marriage to idolaters until they believe, and certainly a believing servant is better than an idolater, even though he should please you; these invite to the fire, and Allah invites to the garden and to forgiveness by His will, and makes clear His communications to men, that they may be mindful. S. 2:221 Shakir
