The Moral Argument
Kant didn't use this as an argument to try to prove the existence of god, it was just a general argument.
Kant believed that ..
1) All humans have a sense of moral awareness and that it is our obligation to be virtuous to others.
2) Kant believes in 'ought' implies 'can' if someone says you ought to do something then it means you should be able to to do it for example you 'ought' to tidy your bedroom to make you mother happy
3) We must aim for the highest standard of virtue possible
4) True virtue should be rewarded with happiness