Having welcomed into my home and talked to quite a number of people preaching door to door (and having even participated in an organised discussion between Physics Degree pupils and a preacher of some Baptist church) I can confirm it's invariably a logic chain that is either circular or ends up in some supposedly "truth" about which there can be no questioning (aka an axiom) the most basic one being "it says so in the Bible".

Either that or it's some poor old ladies who really can't string much of a logic chain of though (it's pretty much direct to "it says so in this book").

And it's all perfectly acceptable in one's Personal Sphere. It's just not an actual argument to justify anything outside the Theological and Personal Spheres, such as, for example, having the Law impose one's Morality on others or having one's country managed in one way rather than a different way.

For me Religion is absolutelly fine as long as it stops at the boundary of the religious person's life and choices, and does not go into shaping other people's life and choices: believers can feel free to try and convert others so that they shape their own life and choices the same way, just not to force their own morality on others.