The standard mythology is that Saturn was a tyrannical father overcome by Lord Zeus. The name of Saturn was later transformed to, 'Satan,' (see the linguistic similarity.) The Christian Churches make a great deal of use of the Father image, as well as the image of God as a martyr (that would be Jesus.) However, I think it would be a mistake to directly link Saturn to either the Father God of Christianity, or to the Satan of Christianity. The sources are there, but the images are distant from those sources.
In terms of Gnosticism, Gnostics almost certainly looked to the tyrannical father image of Saturn for their inspiration for their image of the Demiurge. Gnostic philosophy was concerned heavily with, 'dark vs. light,' but also, 'freedom vs. tyranny.' In fact, ancient Gnosticism probably drew more directly from the Roman Saturn than Christianity currently does, because Gnosticism was prevalent and died out before these contemporary interpretations of Christianity formed.
"... And you shall know the truth, and the truth shall set you free..."
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