not sacreligious, because they're still part of the sacred writings. just slightly unconventional perhaps
i loved each and every one of the 'complete fairy tales' and am sure i'll be revisiting them time and time again. they are all delightful and probably have more depth to them than anything else i've read in the same genre.
but while the fairy tales are charming, phantastes is life changing. it's so emotionally charged, so disturbing and comforting by turns, and has such memorable scenes (the episode with the beech tree, the story of cosmo, the time of recuperation in the old woman's cottage...)
but then of course, phantastes isn't something you could read as often as the fairy tales, precisely because of the heavier tone. i could read the shorter fairy tales (and indeed the princess and the goblin, and at the back of the north wind) any time, whereas i would have to allow much more time to elapse between each reading of phantastes.
"This is and has been the Father’s work from the beginning-to bring us into the home of His heart.” George MacDonald.