As a pre-literate child, I imagined that writing as a form of communication was a ruse, and that adults just pretended written words were meaningful. Mercifully and quickly I grew out of that foolish notion and became a voracious reader.
When I learned some children don't learn to read, and grow into adults who are illiterate, I was incredulous. How does one live in a reading culture without knowing how to read??
Though I don't live near a school which facilitates teaching adults to read, I can encourage other readers to help promote adult literacy (in the USA) for those who are ready to learn. Other ways to promote literacy? Read to children; they're great at imitating.
And reading is a foundation for learning other skills.