I think a true Christian can deny the deity if Christ (I'm not saying they are
correct by the way). But not everyone is an instant theologian on all biblical
subjects over night.
The trinity takes some getting your head around. It usually takes a revelation from
God, the penny to drop etc. Most children for example just repeat what they are
taught but then a young Christian growing up has to think things through for themselves.
I became a Christian around the age of 11 with absolute certainty. But it didn't
occur to me that Jesus and God were the same for a long time. As for the Holy Spirit I honestly
had no idea who he was, i thought he was some sort of energy from God or something.
It wasn't until I was in my early 30s that I realised the Holy Spirit was a person,
God the Holy Spirit and that's just as important.
People need room to mature and grow in Christ, you don't go from a spiritual, new born to a
pensioner overnight. Just because people haven't figured everything out yet, doesnt mean they are
not Christians.
God doesn't expect us to pass a theological exam before we can be born again.
The same goes for many subjects on here.
Whether a person comes to salvation as a child or comes to salvation as a 70 year
old, they are both babes in Christ for a season. Even the disciples didn't instantly,
realise Jesus was God and they walked, talked and ate with him.
Maybe we need to be directing people to the truth of this aspect, rather than
highlighting their short comings and trying to show them up.
John 14:7-11 NKJV
[7] "If you had known Me, you would have known My Father also; and
from now on you know Him and have seen Him." [8] Philip said to Him,
"Lord, show us the Father, and it is sufficient for us." [9] Jesus said
to him, "Have I been with you so long, and yet you have not known Me, Philip?
He who has seen Me has seen the Father; so how can you say, 'Show us the Father'?
[10] Do you not believe that I am in the Father, and the Father in Me? The words that
I speak to you I do not speak on My own authority; but the Father who dwells in
Me does the works. [11] Believe Me that I am in the Father and the Father in Me,
or else believe Me for the sake of the works themselves.