I found your post to be quite intriguing. You made several valid points concerning the foundation of secular music as being a method of self-expression. It allows for the expression of our own personal realities in musical form.
I must be honest. I sensed an acute bitterness to the topic of worship music in your post. I am grieved that you possess such a low opinion of these musicians and their workmanship. Certainly their intent is not to defame the Lord through musical expression. Scripture affirms that the Lord inhabits the praises of His people (Psalms 22:3). Note in this portion of scripture that there are no stipulations. The measure of lyrical eloquence, musical dictation, and chord progression are not mentioned in enhancing or deterring from the original intent. Whether worship is expressed in simplicity or complexity, God is present.
Indeed renditions of Christian worship music have occurred. However, various arrangements of the same song have occurred in every musical genre. I understand that the originality of song enhances its meaning as the lyrics and melodic composition were born out of the composer’s intimate reality. However, upon listening to these songs we are given the opportunity to assert our own interpretation for the sake of personal relevance. It is in this process that we as listeners are persuaded, engrossed, or overtaken by the connection we have formed with a particular piece of music.
The same is true in worship music. The emphasis should not be placed upon complexity and originality to legitimize its effectiveness in worship. King David encourages readers in Psalm 100 to make a joyful noise unto the Lord (Psalm 100:1). Worship derives from the intent of the heart. The act can either be acknowledging our brokenness before Him or conveying our praise and adoration of who He is. As worshippers our focus should be complete in the intent of our own heart. God is not limited. From the chord progression of C – G – F to genius compositions and poetic lyrics, God is still present.