any church service that includes the words 'now it's time to take our tithes and offerings..'
it may not be preached there openly as a requirement, but 'tithe' is a loaded word with a very specific meaning in scripture. any preacher you hear use that word, if they have any salt, probably knows all too well that it's a loaded word with a very specific meaning.
personally i think churches should not be using that word at all to refer to taking up & collecting gifts. it is wrong & deceptive use of the term, IMO. ((MOO?))
i'm not familiar enough with denominations to say much of it, but certain major groups in Christianity *probably* teach tithing with a justification rooted specifically as part of some kind of weird 'continuation of the covenants' theological stance. i'm thinking specifically of Presbyterians, because i recently visited a Bible-study at a Presbyterian church ((which turned out to be a catechism class, not really a study, but long story)) -- afterwards i did a lot of research into infant baptism, which led me into topics about various kinds of 'covenant' theology. even if i could do a fair job ((that's open to debate)) of describing how a certain theological clique comes to a justification of demanding tithes, i won't because personally i think the theology behind it has a lot of self-conflicting hooey involved and i don't care to spread it. but, that said, there you go, it does exist.
the LDS definitely *requires* tithes. their justification is probably pretty easy to look up but again, load of hooey i don't really care to verse myself in, and i wouldn't call them part of 'the Church' anyhow.