[TheRealThing]

No, I don't question that the spirit of the Church of England also washed up on our shores. Williams wanted to keep politics and religion separate. He saw and experienced what lust for power in this world did to the church.

Well, the Church didn't just wash up on the American shoreline, England sent their best and brightest. Williams was sick of government intrusion into Church affairs because the aristocracy of the day treated the Church of England and the halls of government as if they were upper and lower houses of parliament. The effect of which was to remove God and His power from the government controlled Church. It was all pomp and ceremony with no substance, that's what bothered Williams about the politically charged Church.

If you want to justify laying out of Church or denouncing the Church as corrupt, suit yourself. That is not what the Christian is instructed to do according to God's Word.
Hebrews 10:22-25 (KJV)
22 Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled from an evil conscience, and our bodies washed with pure water.
23 Let us hold fast the profession of our faith without wavering; (for he is faithful that promised)
24 And let us consider one another to provoke unto love and to good works:
25 Not forsaking the assembling of ourselves together, as the manner of some is; but exhorting one another: and so much the more, as ye see the day approaching.

And in my humble opinion, the day has certainly approached.