This morning, a guy in church came up to me saying he disagreed with my sermon because I said Jesus on the cross was God. He said that Jesus emptied himself and therefore became solely human, till He went back to heaven, where he became God again. So basically, Jesus on earth was not God.
I'm not as well informed on the Early Church as I should be, but this sounds like a variation of Arinism to me and hence, a proper heresy as condemned by the eucumenical councils of Nicea in 325 and Constantinopel in 381.
Is this correct?