At a simplified level yes. And certainly Greek philosophical dualism presents something of a stumbling block.Abrahamic religions are 'dualistic'...
I can't speak for Judaism, but it always seemed much more holistic in the sense that closer attention to Hebrew ideas might have preserved against an overt Hellenistic dualism. The Christianity v Platonism debate is well recorded.
Not according to Christian doctrine.... therefore God cannot be in man, and man cannot be in God.