Then why did Luther remove books after those God-inspired men had established what was canonical?
Luther like Jerome considered them as edyfying but not inspired. Even Pope Gregory the Great (ca 600 AD) when quoting 1 Maccabees says, "We address a testimony from books though not canonical, yet published for the edification of the Church." Most Protestant Bibles up until the 17th century had the Apocryphal books in them although included in a separate section from inspired Scripture. Doctrine should not be formulated through uninspired writings.