Correction on my last post: In describing the earliest of liturgies, my post should read that it is ascribed to St. James the Just.
As to how people in churches with ritual learn Scripture, did you know that the Watchtower never told you that we would not have Scripture if it were not for these ritual liturgies?
The canon of Scripture, both Jewish and Christian, were determined by their use in liturgy. (For those of you who were kept in the dark about religion history while in the Watchtower, "liturgy" is a formal worship service; it is like a script to follow, stating what prayers get said, what psalms get sung, what Scripture texts get said, and on what day of the year this happens.) The Jewish Tabernacle/Temple liturgy consisted of prayers which became the psalms. Some of these were chanted or sung between a leading priest and the worshiping audience, often in responsorial antiphons where the audience repeated a chorus in reply to the worship leader, such as found in Psalm 136.
The Temple service became adjusted for smaller synagogue service. This liturgy used an annual cycle of readings from the Torah and the other books of what would become the Jewish Scriptures, read on a schedule that marked the annual festivals prescribed by the Law.
The earliest Christian liturgies, like the above mentioned, adapted the synagogue service. But they introduced two new facets: Justin Martyr, writing in the 150s CE, stated that "on the day called after the sun there takes place a meeting....The memoirs of the apostles are read, as are the writings of the prophets...When the reader has finished, the president, in his speech, admonishes and urges all....Then we all stand and pray together aloud. When the prayers are ended, we greet one another with a kiss. At that point, as we have already said, bread is brought, with wine mixed with water."
These items were used for a weekly Eucharist/communion service. Justin wrote that "none is allowed to share unless he believes the things we teach are true....For we do not receive them as ordinary bread and ordinary wine, but as Jesus Christ our Savior."
The texts used in common around the world in this liturgy eventually became the Christian Scripture canon, originally consisting of the Alexandrine Septuagint for the canon of the Old Testament and establishing the New Testament by the end of the 4th century. People learned the Scriptures by hearing them read on a cycle similar to the synangogue service, except these cycles became based on the birth, life, ministry, Passion, and resurrection of Christ throughout the year instead of the Jewish festivals.
The Bible was not available to individuals either in ancient Israel or even the first centuries of Christianity. Besides the canon being unsettled for Christians until the late 300s and literacy levels being low, widespread ownership of the Bible did not occur until the famous barefoot walk of the poor Welsh girl, Mary Jones, inspired Bible societies in the mid 1800s throughout the West to find a way to invent a way to provide Bibles for all.
Russell was born into a world where a loud minority of Adventists (and other new movements from the Second Great Awakening era in the USA) promoted an ignorant history that made it sound as if all people have always had access to a copy of the Scriptures since the first century, but had been oppressed from free Bible study by "papists and liturgical Protestantism." The truth is that individual Bible ownership is a relatively modern phenomenon that was born about 80 or so years before World War I. Prior to this there were almost no means to provide Bibles to anyone except mostly churches and the rich, and most people learned the Bible in church groups or from the liturgy and catechesis (as well as Protestant Sunday schools).
American New Religious Movements which discarded the liturgy (most due to simple ignorance), developed religious "services" based on Protestant Sunday school settings, and not due to historical research on how Christians originally worshiped. The Watchtower religion came from these uneducated groups who made up an impossible first century "history" where "true Christians" went about preaching and studying from their personal copies of the Bible...despite the fact that such a history was totally impossible, false, and a fantasy of the stupid.