What a great question and good discussion.
I agree that there certainly is no obligation to participate in any kind of religious or spiritual protocol anywhere on the Camino.
Nevertheless, I wanted to see what boost a Camino would have on my admittedly flagging religious sentiment. I took a small book of Psalms - I think it was selected psalms, to make a slim volume even slimmer. I like the Psalms because there is one for every imaginable human emotion, they can be taken in short bites, and they are lyrical.
I took a rosary with me and started each day, walking solo before getting that first cup of coffee, with a rosary. Easy peasy. By the end, I had it pretty well memorized.
The rosary routine, walking solo, a few miracles along the way, all changed my outlook on God, religion, the human experience and my infinitesimal part in it, in unimaginable and totally unexpected ways for the better.
A couple of comments - getting a blessed rosary from Santiago is wonderful, but if you wait until you get to Santiago to get your rosary, what are you using for the hundreds of previous kilometers? Take a rosary with you from the beginning. Also, although I appreciate the convenience of using your phone for apps, walking and reading on your phone doesn’t sound like the safest way to get from point a to point b. I’m such a klutz as it is. I used a slip of paper with brief notes when I needed a reminder of what comes next and I made up my own personal ways of doing the rosary.
I feel uncomfortable being “forced” to share personal details with strangers. Introvert, what can I say.
The only time there were actual group prayers were in Mass.