Actual believers must preach to other people not to commit evil deeds!

Verses 163-166 of Chapter 7:
And ask them (O dear Prophet Mohammed - peace and blessings be upon him) of the township that was by the sea; when they used to exceed in the matter of the Sabbath - when their fish used to come swimming atop the water in front of them on the day of Sabbath and not come on the days it was not Sabbath; this is how We used to test them, due to their disobedience. And when a group among them said, "Why do you preach to a people whom Allah is going to destroy or mete out a severe punishment?" They said, "To have an excuse before your Lord, and that perhaps they may fear." And when they forgot the advices they had been given, We rescued those who forbade evil, and seized the unjust with a dreadful punishment - the recompense of their disobedience. Consequently when they rebelled against the command to refrain, We said to them, "Be apes, despised!"

Does God not allow believers to marry disbelieving women regardless of whether they are from those who  received His books earlier or not?

Verse 221 of Chapter 2:
And do not marry polytheist women until they become Muslims; for undoubtedly a Muslim bondwoman is better than a polytheist woman, although you may like her; and do not give your women in marriage to polytheist men until they accept faith; for undoubtedly a Muslim slave is better than a polytheist, although you may like him; they invite you towards the fire; and Allah invites towards Paradise and forgiveness by His command; and explains His verses to mankind so that they may accept guidance.

Verse 5 of Chapter 5:
This day the pure things are made lawful for you; and the food of the People given the Book(s) is lawful for you - and your food is lawful for them* - and likewise are the virtuous Muslim women and the virtuous women from the people who received the Book(s)* before you when you give them their bridal money - marrying them, not committing adultery nor as mistresses; and whoever turns a disbeliever after being a Muslim, all his deeds are wasted and he will be among the losers in the Hereafter.

* 'and your food is lawful for them' could be relevant only to those only who had been Muslims (or, actual followers of the holy Book(s)) before the last prophet came and thus accepted  Al-Qur'an and the last prophet when he came. Relating the word 'them' to the Jews and Christians who were disbelievers (i.e,, who did not accept  Al-Qur'an and/or the last prophet) is not justifiable. 

* 'the virtuous women from the people who received the Book(s)' indicate those who were believers  (or, actual followers of the holy Book(s)) before the last prophet came, and later, accepted  Al-Qur'an and the last prophet.

Verse 10 of Chapter 60:

O you who have believed, when the believing women come to you as emigrants, examine and test (their faith), although Allah only knows best the truth of their faith. Then, when you find them to be true believers, do not return them to the disbelievers. Neither are they lawful for the disbelievers nor are the disbelievers lawful for them. Return to their disbelieving husbands the dowers that they had given them; and there is no blame on you if you marry them when you have paid them their dowers. And you also should not hold back unbelieving women in marriage. Ask for the dowers that you had given to your unbelieving wives, and let the disbelievers ask for the dowers that they had given to their Muslim wives. This is Allah's command: He judges between you, and He is All-Knowing, All-Wise.