The Greek Pantheon in Medieval Christendom

I love Middle English. It is fun to read, tickles the ears and is novel to the tongue. (I can't help it!) Something that has stuck out to me while reading Chaucer is the liberal sprinkling of Greek mythology throughout this medieval text. Written during a time known for its intolerance of pagan religions, I found this fascinating and confusing. The Knight's tale features Greek gods, the main characters all praying to their respective patrons and being granted a sign. The wife of Bath refers to the gods nearly as frequently as she does  Christian saints and Christ. (She was clearly well read) and Chaucer was not the only author of the age to mingle Christianity with polytheism, Shakespeare was fond of lacing his work with the ancient conquerors as well. Furthermore, while earlier works such as Beowulf continue to spark lively debate about its inclusion of old pagan customs nary a word can be found disputing the inclusion of the Greek pantheon. My best guess is the influence of early Roman conquest combined with the continued use of Latin in the written word allowed for a kindness toward the religion that Christianity toppled. Also noted, is of the selected sections we have read, only those portrayed as somewhat learned and traveled, the knight and wife of Bath, reference mythology in their tales. It is notably absent in the Miller's tale. Hmmmmm.