Actually, it's not about marriage. To consider a chapter about women captured in war to be be about marriage is like equating Guantanamo Bay to a holiday camp. This chapter and verse is about taking a woman captive, deciding to take her home and having sex with her. If you don't enjoy the sex then let her go. But if you do then you can be her husband (whether or not she likes the idea). Let me quote a longer portion of the chapter.
Deuteronomy 21
10 “When you go out to war against your enemies, and the LORD your God delivers them into your hand, and you take them captive, 11 and you see among the captives a beautiful woman, and desire her and would take her for your wife, 12 then you shall bring her home to your house, and she shall shave her head and trim her nails. 13 She shall put off the clothes of her captivity, remain in your house, and mourn her father and her mother a full month; after that you may go in to her and be her husband, and she shall be your wife. 14 And it shall be, if you have no delight in her, then you shall set her free, but you certainly shall not sell her for money; you shall not treat her brutally, because you have humbled her.
Commandments like this show why Deuteronomy (and much of the Old Testament) is ignored. If you ignore this, then surely it's not a big step to ignore circumcision?
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