We have to bear in mind that the word "diakonos" existed before it was used to describe a position in the church. It means "servant" (which is why it is translated as such in so many versions). The position is even only for a man. In the specifications given in Timothy we read "Their wives likewise must be dignified, not slanderers, but sober-minded, faithful in all things. Let deacons each be the husband of one wife, managing their children and their own households well." (1 Timothy 3:11-12 ESV) And as I have said earlier, a woman can be a wonderful servant, not serving in positions that are for men only, and without disobeying God's commands.
1 Timothy 3:12: "A deacon [
diakonos] must be the
husband of but one wife and must manage his children and his household well."
Well, let's consider some questions for a moment. Does your church (or other churches that you know) have any deacons who are unmarried? If so, then those churches are not interpreting 1 Timothy 3:12 (above) in its most literal sense. Does your church (or other churches that you know) have any deacons who are childless? If so, then those churches are not interpreting 1 Timothy 3:12 (above) in its most literal sense. Does your church (or other churches that you know) have any deacons who don't manage their children very well (perhaps their children are "wild" or they don't obey very well or they're hard to handle, etc.)? If so, then those churches are not interpreting 1 Timothy 3:12 (above) in its most literal sense.
So the question is, how literally are we supposed to take 1 Timothy 3:12? If Paul intended for his statement to be taken completely literally then that's fine, it just means that Phoebe was not a deaconess and that deacons must all be married men who manage their children and households well.
But is it possible that Paul did not actually intend for his statement in 1 Timothy 3:12 to be taken in its most literal sense? Consider that Paul made many male-oriented statements such as the following, which we don't interpret in their most literal sense:
Romans 8:14: "because those who are led by the Spirit of God are
sons of God."
Romans 8:19: "The creation waits in eager expectation for the
sons of God to be revealed."
Also Romans 9:3,4; Galatians 3:26; 4:5-7; Ephesians 1:5; Thessalonians 5:4,5.
Paul had a tendency to speak in the masculine form by referring to "sons" and "brothers," and notice that we mentally interpret these statements as if Paul had said, "sons and daughters" and "brothers and sisters." In the
majority of male-oriented statements that Paul made, we
don't take them completely literally. In fact, in English we tend to speak in the masculine form as well, without meaning it completely literally. For example, imagine that you hear someone say, "If a Christian commits a sin then he should repent and confess his sin and God will forgive him." When we hear statements like this, we mentally interpret such statements as if they're referring to men
and women, just as we mentally interpret Paul's statements above as if they're referring to men
and women.
Since Paul had a tendency to speak in the masculine form without intending for it to be taken completely literally, then perhaps this is what he was doing when he said that a
diakonos must be the husband of one wife and must manage his children and his household well (1 Timothy 3:12). He might simply have meant something like, "If a deacon is married, then he or she must be a one-woman man or a one-man woman, and if he or she has kids then he or she must be able to manage his or her children and his or her household well." Notice how awkward it is when we try to be as specific as possible in such a statement, which is why we rarely use "he or she" and "his or her" in English. Instead, we tend to use "he" and "him" even when we're referring to men and women in general.
What it boils down to is that if a church or denomination takes 1 Timothy 3:12 in its most literal sense then we would expect their deacons to all be married men who manage their children and their households well. But if a church or denomination takes 1 Timothy 3:12 as being simply a masculine form of speech (similar to many other male-oriented statements that Paul made), then we wouldn't be surprised if they have female deacons.