A number of religions use this verse to name the True Church. A majority are “restorationist” sects, where the common belief is that an apostacy occurred in the 4th century (Council of Constantinople 325 AD and 378 AD where the Trinity doctrine was formed), that it was restored 19th-20th Century, and they maintain a non-Trinitarian belief. There are a couple Trinitarian sects that use Acts 20:28 as a naming basis.
Based on a previous blog, we discovered that the American Standard Version supports Rom 16:16.
Romans 16:16King James Version (KJV)
16 Salute one another with an holy kiss. The churches of Christ salute you.
Acts 20:28 American Standard Version (ASV)
28 Take heed unto yourselves, and to all the flock, in which the Holy Spirit hath made you [a]bishops, to feed the church of the Lord which he purchased with his own blood.
Some will disagree and say the name of the true church is “church of God” based on Acts 20:28. If you look at some called “Church of God” (and there are several) a majority observe Saturday Sabbath (Saturday worship vs Sunday worship is another topic in itself; the days of the week names are of pagan origin anyway) and they are borderline isolationist. Let’s look at the below translations of Acts 20:28 and analyze each one.
Acts 20:28King James Version (KJV)
28 Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood.
It could be interpreted the Holy Spirit purchased with his own blood if you block out the phrase “to feed the church of God” or that Christ is God if you support Rom 16:16.
Acts 20:28New International Version (NIV)
This would support that Jesus Christ is God. Notice punctuation difference vs KJV
Acts 20:28Good News Translation (GNT)
The GNT supports a Unitarian church of God (Revised English Version and New World Translation call it “congregation of God”).
Armstrongism and Members of Church of God International (MCGI) are non-Trinitarian. The big difference is that Armstrongism has some JW trappings (like not serving in the military or celebrating birthdays, believing the 2nd death is cessation to exist) and observes a Saturday Sabbath. MCGI believes in an immortal soul and worships on Sunday.
There are also two “church of God” movements (shown on the “about” page) that believe it is not an organization and observe Saturday Sabbath. They do not recognize Heb 10:25