An assumption of godform means believing that a god or godlike being exists. To put it another way, it is like believing that a powerful being is watching over us and helping us.
For example, some people believe in a Christian god, who loves us and looks after us. Others might believe in a Hindu god, who creates and controls the world.
Believing in a godform is like believing in someone or something that is larger than us, and can help us in different ways. People who believe in a godform often find comfort and strength from their faith.