This is the first time that I have encountered the term "mindfulness" as a philosophical/religious faction.
As an adjective - "bearing in mind" or "inclined to be aware." is how I have understood it. Simply a act of keeping things in mind - like remembering to be polite.
Or as in your use as a noun - "the quality or state of being mindful" or more fully, "the practice of maintaining a nonjudgmental state of heightened or complete awareness of one's thoughts, emotions, or experiences on a moment-to-moment basis." - both sourced from MerriamWebster.com.
Still, to me, it means being aware in polite company to talk and respond politely.
It seems how you use it so reverently that it is more metaphysical than I have ever understood it. For instance, I do not judge my own thoughts or emotions or experiences or knowledge with any intensity nor moment by moment. However, I do try to keep watch over them so they don't wander away from reality.
When you said, "I walked away feeling very much excluded," my first reaction was that you judged them as unworthy of associating with them and the inverse was true - you were excluding them! (Of course, I could be wrong.)
Next, I would point out, about half of your bullet points are in error and without solid foundations, and your list of "only men" have nothing to do with God, Jesus, or the Bible - except, of course, for Abraham, the patriarch of Biblical faith.
So, in my view, you are adding too much pepper to the soup.
Look, as far as the MAGA Evangelicals are concerned - when compared to Biblical Christianity, they "have left their first love" as Jesus warned one church recorded in the Book of Revelations. Politics today, in this country anyways, has become nothing more than idolatry - as has the money driven music industry, corporation owned news, and so on.
To finish up, we all fall short of our idealistic views no matter where they originate, and I find critics usually don't have any mirrors to check how they will look to others before going out to the party.
The saddest part is that it all becomes clusters of people in their private precious circles, pointing their fingers at '"the others" and yelling, "You're wrong!" and with many more much worse epithets.
My wife and I wrote an essay that we published on Medium titled "Why We Believe" if you want to understand our particular views more thoroughly.
