Trinity: (John 1:18) No man has seen God. Would you say that is truth?

That's correct. Only Jesus has seen his father Jehovah God and of course along with the angels in heaven as well. No man has ever seen God because God doesn't have a human form. In the bible it even mentions when Moses wanted to see God, Jehovah God told him not to come any closer so that he wouldn't burn because of how powerful and holy Jehovah God is.