Three comments from the long-time admired and recently awarded card-carrying member of my You're the Bomb squad, yay.
The simultaneity of duality and oneness, of separation and connection, is something I speak of often. This poem, https://marcus17043.medium.com/of-duality-and-nonduality-e7c26181c2ed, contains a line similar to the ones that you highlighted and loved following us down the rabbit hole today, "Dual and nonduality Selves conjoin."
It also contains this concluding couplet that speaks to your experience with religion vs spirituality:
All isms only cause separation
Open hearts minds to Divine connection
While contemplating my response to your wonderful comment, today's tanka emerged and took form. You'll see it this morning.