I see no problem with following people so they can follow you back as long as it isn't automated. Following others is essentially a means of reaching out in twitter and I think that as Christians we should reach out. I don't however think automated following should be used by Christian organizations for many reasons. You could accidently follow porn or spam accounts.

I am ok with using automated unfollow though. If the purpose of your twitter account is to outreach for your organization then it would make sense to move on from the people that are not interested and to find others that may find your tweets useful.