Christianity is not the same as ecclesiasticism. Christianity is centered upon Jesus Christ, as he is presented to us in the foundational document of Christianity, the Bible. Ecclesiasticism is centered in the church-its development, dogma and practice. Make no mistake about it, we cannot have Christianity without the church, at least in one vital sense, but the church is reformable and "Jesus Christ is the same yesterday, today and forever" (Hebrews 13:8). Christ does not change, thus the Christian gospel never changes. But the church must change if it is to be truly faithful to both Christ and Scripture.
This principle, and the point I am making through it, is both vital and dangerous. It is vital because without it you have a tradition rooted in particular times and debates, but not a tradition that is alive and vital for the present time. It is dangerous precisely because a church that is subject to the spirit of continuous reformation is a church that can go badly astray in any age or place, and often has. It can become a church that seeks to get so close to the culture that it is virtually indistinct from the culture.
Witness the influence of liberalism on the church in the twentieth century and the resultant bankruptcy of many churches and schools that bought into this deadly form of existentialism. Liberalism presented itself as a necessary reform movement and some of its call was, in actual fact, quite correct. (This is precisely the problem, some of it was correct but the central truth of the gospel of Christ was profoundly threatened over time as the seeds of destructive process infected the church.)