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 या a sacred personage, या to any object regarded as sacred.

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

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

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