The conclusion of belief is no conclusion but a resolution, and thus doubt is excluded.
Philosophical Fragments

I woke in the night and the above quote came to mind. A little on the weird side, I agree, but it all came together.
I have been reading a book about Thomas a Kempis. In this book, there is a discussion on the origins of the Brethren of the Common Life and, especially, the founder, Geert Groote. Groote wrote “Resolutions and Intentions” which was like a Rule of Life but without any vows. And it was common practice in the Brethren for individuals to write such a document and not take religious vows in the traditional way.
The above now makes even more sense to me. Live life without vows or a Rule but live with a clear resolution. Allow life to be shaped by this resolution but make no show of it or put yourself under vows.
So, in the history of the church, there is a way to live a converted (religious) life as a layperson without entering a monastery.
And, as an aside, I really like SK’s side-step on doubt in the above quote!