here is a question... What is the most liberal/radical prayer/office book you have come across... Define all terms yourself, CFS
BCP 1662? Both Liberal, (Liberated the church from Catholicism and superstition), and radical, (Defined a pragmatic way of living the faith of Jesus Christ, avoiding the 'siege mentality' of 'denominationalism'). i.e Reformed but still universally and unapologetically catholic. .
What is the point of this question? Neither liberalism namely secular apostasy, nor radicalism namely the pursuit of extremes on a whim, is to be celebrated... in fact it has produced enormous ruptures in the body of Christ... I could attempt to redefine those words so as to harmonize with Christian orthodoxy, as Tiffy just did... where yes the 1662 BCPis most radical (and the most catholic) prayerbook in Christian history, having shown a pattern of Christian life that’s been lived for centuries on the basis of Liberation from sin and a Radical obedience by man... however I don’t think the questioner was looking for that