Jehovah's Witnesses teach that Jesus was God's first creation, and not God Himself. This is rightly considered heresy, of course... but can you explain why they're wrong about the interpretation of John 1:1, where - they claim - Jesus is "a" god and not "the" God? Video, 5:30
Skeptics of Christianity sometimes claim that Jesus never claimed to be God, and that belief in His divinity was a legend that developed over time. When did this belief develop? How early can it be established?