If you take a look at any of the commentaries on e-sword, it's virtually universally acknowledged that Jesus was singing Psalms 113-118 in Mark 14:26, also called the Egyptian Hallel. This was traditionally sung by the Jews at the time of Passover.

If churches and christians should be using the psalter to worship the Lord, then it follows that the overwhelming majority of 'evangelical' churches are disobeying G-d's command to sing psalms (1 Chronicles 16:19, Psalms 105:2, etc.) By far this appears to be a much, much bigger problem for the church then the handful of exclusive psalmist churches, because they are disparaging G-d's songs, the Psalms by ignoring them?

I would hope we could all at least agree here that G-d has given us a Divinely inspired hymnal in the Psalms and that we ought to use it?

What is superior, a G-d breathed Psalm or a human composed hymn? In a age when the church is largely biblically illiterate, why are we replacing the Bible's hymns (Psalms) with our own? If we really and truly believe that G-d's Word is superior to man's, then why do most 'evangelical' churches not even use Psalters, nevermind use them exclusively?

Luther was most certainly a mighty man of G-d whom G-d used to start the Protestant Reformation, but he of course did not completely follow the Reformed view on worship, in that he permitted hymns of human composition. At the same time, he did not approve of the use of organs, going so far as to say 'The organ in the worship service is a sign of Baal.' In contrast to the Luthern church, the Reformers in Switzerland, the Netherlands and the British Isles, largely promoted the exlusive use of the Psalter in the worship of G-d. Most presbyterian and reformed churches continued this biblical tradition of going back to the Scriptures for our worship and songs until the 19th century. Having said that, Martin Luther promoted the use of the psalter in worship, actually putting metrical psalms to tune and incorporating them into the Lutheran worship service. Luther's preface to the 1545 Luthern Psalter sums it up so well: 'Every Christian... ought, in all reason, to make the Psalter his manual... For indeed the truth is, that everything that a pious heart can desire to ask in prayer, it here finds Psalms and words to match, so aptly and sweetly, that no man—no, nor all the men in the world—shall be able to devise forms of words so good and devout.'

If G-d has given us a divinely written hymnal, then with what biblical warrant do we add to His hymnal with our own songs? The Hebrews practised exclusive psalmody as did the ancient church and the reformers of the reformation, so why change the divine hymns used during the most glorious ages of the church for hymns written by fallible men. One other point, many, many hymns were written by arminians, arians, pelagians, catholics, homosexuals and other heretics of every sect. Very often these writers imposed their false doctrine into hymns. It has been said that heresy very often has been sung into the hearts of the church through the use of uninspired hymns and it is so true today.