Whether God or/and satan exist in the biblical sense is somewhat irrelevant because they, without question, exist in you.
God is your conscience, your empathy, your compassion, your kindness, caring, altruism – universally know as Love. Many beings on Earth are trying to turn you that way.
satan (small ‘s’) is you selfishness, your self obsession, your greed but mostly your fear and all the knee-jerk thoughts and actions that fear brings. Many beings on Earth are trying to turn you that way too
Tomorrow in the UK, everyone over the age of 18 has a chance to meet one or the other or at least to know which one has your allegiance – you can for a moment ‘know thyself’.