When people say they hate God they really mean they hate the actions of those who act in the name of God.
Such a being most likely does not exist. And the concept of God promoted by religions, especially by the Abrahamic tradition, is man-made, i.e. it has clear anthoropological characteristics. To worship or hate such an entity is understandable and absurd at the same time.
religion is all about oppression as a rule
used to scare people into behaving a certain way
the concept of sinning leading to damnation etc
its a load of nonsense
simply does not stand up in the modern world
the other reason people are religious is to take comfort in the after life
people fear their mortality