Every time I hear terms like 'in ministry' or 'the ministry', I begin to fume. It's a conflation of ministry with ordained ministry, which may be traditional - from the days when everything revolved round the minister - but which can't be justified. As Paul points out, God calls people to different roles - or maybe he just calls them, and they work out the details for themselves. He doesn't seem to call quakers to ordained ministry, or Methodists to the papacy, and I suspect our choice of role, and the type of church community we create for ourselves, has some sort of influence somewhere.
So we have church cleaners, secretaries, treasurers, property stewards, church stewards, communion stewards, book stewards, circuit stewards, worship leaders, local preachers, and so on. Every denomination will have its own list, and we're always inventing new roles. So what are we doing allowing a small group of people - maybe half a percent or so of the total - to hive themselves off with the assumption that their specific form of ministry is somehow special or normative? They may or may not be thinking that, but it's what the language they use implies. We're all called to ministry, in the fullest possible sense of the word, and no role is superior, except, of course, that cleaners are a lot more useful and practical than preachers. All we do is stand up and woffle, yet we, along with the ordained, are the only ones supposed to have a 'call'.
God creates us all, God calls us all, God equips us all. We need to celebrate every ministry, not just one, with all the rest treated as afterthoughts.