Hebrews were not allowed inter-mix with even other tribes because of the lots of land that each tribes were given, but they,probalby men, could marry a non Hebrew and bring them into the family. However, they were not to take women who believed in false gods and did not believe in the true God, YHWH. It really does sum up the entire O.T.
Back to Paul:
Paul knew what was going to happen to the new Christain sect. I believe he was preparing the people for the end of the system as they knew it. I believe some of the new Christains died for Christ and some turned back to temple gods, immoral acts, or was carried away with too much riches.
Pauls letter was written because of immoral acts and since I do not know how Corinthians letter were actually written perhaps 3 or 4. I can only imagine how hard it must have been for the Christains to figure out how they must act.
I believe that under the harsh circumstances Paul was kind to the brothers and sisters. If a person was in passion for his fiance then he could marry its not a sin. Does that sound like they went a little too far? I mean at the kingdom hall one would get disfellowshipped. :-) Sorry I had to bring that one up but it is true!
Many historical theologist are going over exactly what you asked,and they can not agree with some of Pauls letters.
Paul knew that preaching the gospel of Christ was the most important calling one could do, and to do that it would have been better to stay single,virgin. I want to point out that Paul could have been married yet at this time he could be a widow/divorced so he knew that it would be better to stay as a virgin or single. Paul knew that in the past, such people like some apostles could have been married and it could have cause them hardship with their wives.
As far as Moses he was getting direct guidance from God thru angels, unlike Arron or Mariam. I think he spared the two and did not kill them for questioning his prophet. Still you have a good question about Moses wife,hmm, I wondered if this was the same wife from his youth? I do not think there any proof that this wife was Sipora? I hope I got her name right!
MARRY IN THE LORD!
Most churches out their would prefer members to become yoked together with other members to spare division of faith, although we are all christains. There is a scripture to marry evenly yoked because christains should not marry non christians. I know some people raise their children into a diverse back ground,such as pagan and christains. Hmmm kind of hard to marry a pagan when that was the problem with the Hebrew nations, unless the pagan changes to christians. But then they could backslide after they marry you then your stuck! Oh well you would not be bound to an unbeliever! but that is if you were not a christain prior to marrying a pagan. Different scripture!
Here something you could think about, because I am sure many people on here has already considered this point, When did marriage certificates start? If two people have a party and declare their love for one another would that not be consider a marriage? I believe so, however the certificate was invented to legally protect women and their children. Oh well, it was fun!
Hmmm I do remember seeing a scripture stating to marry only in the Lord?
Peace!