Yes, many have of their own accord denominated themselves.
What is that reason?
We seem to be talking past each other - what do you mean by denominated?
People describing themselves and calling themselves names of their choosing rather than God's.
Where did God tell us what label to use for His Church? The Church seems quite sufficient - where is the instruction to call it anything more than that.
Christ's church is not a label. It shows possession and to whom it is of.
God does not describe it as "the church"
The Holy Spirit of God through the writers of the Bible describes it as Christ's.
Belongs to God ---- 1 Timothy 3:15
The body of Christ ---- Ephesians 1:23; Colossians 1:24
Christ, the foundation-stone of ---- 1 Corinthians 3:11; Ephesians 2:20; 1 Peter 2:4,5
Christ, the head of ---- Ephesians 1:22; 5:23
Loved by Christ ---- Song of Solomon 7:10; Ephesians 5:25
Purchased by the blood of Christ ---- Acts 20:28; Ephesians 5:25; Hebrews 9:12
Sanctified and cleansed by Christ ---- 1 Corinthians 6:11; Ephesians 5:26,27
Subject to Christ ---- Romans 7:4; Ephesians 5:24
The object of the grace of God ---- Isaiah 27:3; 2 Corinthians 8:1
Displays the wisdom of God ---- Ephesians 3:10
Shows forth the praises of God ---- Isaiah 60:6
God defends ---- Psalms 89:18; Isaiah 4:5; 49:25; Matthew 16:18
God provides ministers for ---- Jeremiah 3:15; Ephesians 4:11,12
Glory to be ascribed to God by ---- Ephesians 3:21
Elect ---- 1 Peter 5:13
Glorious ---- Psalms 45:13; Ephesians 5:27
Clothed in righteousness ---- Revelation 19:8
Believers continually added to, by the Lord ---- Acts 2:27; 5:14; 11:24
Unity of ---- Romans 12:5; 1 Corinthians 10:17; 12:12; Galatians 3:28
Saints baptized into, by one Spirit ---- 1 Corinthians 12:13
Ministers commanded to feed ---- Acts 20:28
Is edified by the word ---- 1 Corinthians 14:4,13; Ephesians 4:15,16
The wicked persecute ---- Acts 8:1-3; 1 Thessalonians 2:14,15
Not to be despised ---- 1 Corinthians 11:22
Defiling of, will be punished ---- 1 Corinthians 3:17
Extent of, predicted ---- Isaiah 2:2; Ezekiel 17:22-24; Daniel 2:34,35; Habakkuk 2:14