What's the difference between worship and slave?

Well worship is like worshiping God. Slave is someone who was sold to another person and is forced to do what the boss tells them and if they don't they can some times get a brutle punishment.

worship: reverent honor and homage paid to God 또는 a sacred personage, 또는 to any object regarded as sacred.

slave: person who is the property of and wholly subject to another; a bond servant.

당신 cannot be serious. 당신 just can't be.

There is none. If 당신 worship a god, 당신 have eternal damnation (punishment) to fear, so in your mind, worship becomes mandatory to avoid said punishment. Also, psychologically speaking, it's almost impossible to stop believing, especially if 당신 were raised into a religion. Faith becomes part of your subconscious and gives 당신 little 우주 for choice and actual freedom.