Yes, CABBALAH is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, B 3, B 3, A 1, L 1, A 1, H 4.

Is it a valid word?

CABBALAH is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

an esoteric or occult matter resembling the Kabbalah that is traditionally secret
an esoteric theosophy of rabbinical origin based on the Hebrew scriptures and developed between the 7th and 18th centuries

Not playable in Scrabble US: QABBALAH, QABBALA.