So how do we determine who Jesus is? Fortunately, we do not have to “check our brains at the door,” as Josh McDowell said. Instead, we can use our logic to make a pretty simple determination.
Jesus was either:
(1) God, if His claim about Himself was true, or
(2) a bad man, if what He said was not true, for good men do not claim to be God.
But he was not a bad man.
(In fact, if anyone in history was not a bad man, Jesus was not a bad man.)
Therefore, He was (and is) God.
This is the essential Christian argument.
–Peter Kreeft