They wrote: "The collapse of liberal Protestant churches in the modern era, accelerated by their abandonment of key elements of Christian belief and practice in the name of pastoral adaptation, warrants great caution in our own synodal discussions." (1)
What is needed in our modern society is not more caving-in to the selfish adult spoilt brat bullies holding our society to ransom (and bulldozing everything good in their path), all in the name of the rampant, man-exalting, secular humanist religion, but a return to God's ways, to the Bible.
Just as Martin Luther spoke up in 1517 and started what became known as the Protestant Reformation, so we need to be continually reforming today, back toward God's revealed truth. Reformation means to come back to the Bible, to what God has revealed to man, and to turn away from the corruptions and distortions we have been led astray to. We need God's truth rather than what man would like God's truth to be.
The collapsed Protestant churches these 13 Cardinals speak of, have collapsed because they have strayed off course. They teach man's foolishness rather than God's wisdom. They have exalted men, in the form of charismatic priests, modern scientists and critical scholars, rather than God. In so doing they are no longer Christian churches, and can therefore offer their listeners no hope.
A Christian church surely is one which teaches and trusts the teachings of Jesus as handed down by the Apostles (which includes the Old Testament as Jesus made clear), which gathers to worship God as He has revealed Himself in the Bible (not the one made by men in their own image), to have fellowship, communion and to pray (Acts 2:42).
Bravo to these Cardinals for their call (maybe not as in-depth as is needed) for a new Reformation, it is exactly what is needed.