@Adam Bing,
Think of it this way. You're trying to apply a text that is thousands of years old, has been translated and edited and retranslated, to a religion that believes New Testament law supercedes Old Testament, and the text itself is of course, subject to interpretation (doctrine). It may not make any sense to you, but to a modern Christian, it may be completely reasonable.
i.e. define "illegitimate birth" define "congregation of the Lord"
A person who is born without legal documentation cannot enter a Methodist church service?
See my point?