Yes, SAVIOR is a Scrabble word!

Letter values in Scrabble US: S 1, A 1, V 4, I 1, O 1, R 1.

Is it a valid word?

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

a teacher and prophet born in Bethlehem and active in Nazareth; his life and sermons form the basis for Christianity (circa 4 BC - AD 29)
a person who rescues you from harm or danger

Also: jesus of nazareth, the nazarene, jesus christ, good shepherd.

Not playable in Scrabble US: JESUS, CHRIST.