Secularization is fundamentally about a break in the chain of memory. Ecumenical dialogue attuned to its problems would focus on a common project to spread the gospel to every corner of the world.
Memorizing prayers, by definition, means that the prayers become inscribed on your soul in a new way. You become mindful of the words, and they come to rest in the “fields and vast palaces of memory” (see Augustine, Confessions X.12-26), engraved on the walls of those palaces for your perusal at will.