Do you think Jesus was trying to say God LOOKED like him, or that he meant Phillip should regard Jesus as the conveyor of the ‘word’ of God?
God had Isaiah to write a prophecy, long time before the event took place. Isaiah 7:14 Therefore the LORD Himself shall give you a sign; Behold a virgin shall conceive, and bear a son, and shall call his name Immanuel.
This name/word Immanuel means 'God with us'. So I take Christ at His word in telling Phillip that to have seen Him, Jesus, was to have seen the Father. These flesh bodies house the soul/spirit intellect, and upon that Mount of Transfiguration Moses and Elijah looked the same in a transfigured body. Christ still looked the same after the Resurrection and yet His Spirit body could pass though a literal wall.
It is also Written that flesh and blood cannot inherit the kingdom of God;... even the children of Israel knew that much when they Exodus 20:19 And they said unto Moses, "Speak thou with us, and we will hear: but let not God speak with us, lest we die."