noun
belief that printed matter is reliable
Refers to the tendency to trust anything that appears in print, often used critically to describe uncritical acceptance of written information.
活字信仰が強いと、新聞に書いてあることは全部正しいと思い込んでしまう。
If you have a strong belief in the printed word, you end up assuming everything written in the newspaper is correct.
Compound of 活字 (movable type; printed characters) and 信仰 (belief; faith). The term likely emerged in the modern era with the spread of mass printing.