The Book of Enoch is false, surely not written by Enoch himself, LOADED with forbidden names (of demons) which ought not be uttered, and is definitely not biblical even though the Apostles seem to quote the book a little (which doesn't make it scriptural), I understand that.
However, is it a sin to possess and/or read the Book of Enoch? I collect books, you see, and the [First] Book of Enoch (perhaps even II Enoch [on Secrets] and III Enoch [on Metatron]) would be an interesting addition to my collection. I need not believe something if I read it, nor do I need to read aloud the names of fallen angels contained in that particular book.
If "Yes," well that's disappointing, but would I endanger myself in reading or even having this noncanonical text on my shelf?