You seem a very reasonable person to explain things to. Yesterday, I initially chatted to someone, and asked them, if, a person believed the Holy Spirit fully dwelt in the perfect body of Christ, would that mean they could only see Christ as an ordinary man? This was not directly addressed. I also pointed out, that as Trinitarian theology believes the Holy Spirit is God Himself, there would then be no difference as to the essence of Christ, between believing that and trinitarian belief, the difference would simply be in the title given to Christ. In such circumstances, I do not believe there should be a problem at all. If a person considered Christ an ordinary man, that is very different, but he is not, and I do not believe that, and I am sure no others do either here. If the difference is only in the title of Christ, and not the essence of Christ, in my view, it is anti biblical to say believing in the name Son of God for salvation is not enough.
I would also add, though you and I may not give the same actual title to Christ, we much agree as to the message of salvation. We can only do that because the same Holy Spirit dwells in both of us. You cannot be as one, in unity of belief, in the message of the cross unless the Holy Spirit brings you to such unity. Anyone who is indwelt by the Spirit is in a saved state, and accepted by God.
I think sometimes, it is easy, on websites such as these to demand strict belief in dogma, with inflexibility concerning that. We all get things wrong at times, none are perfect in all knowledge, but God, in his great love for us allows for our mistakes
God Bless