Considerin that, you believe that anyone who confesses belief in Christ that does not conform to Trinitarian dogma to be non-christian...
Consequently, in your world, faith in the Trinity ... trumps ... faith in Christ?
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Yes and it doesn’t trump it, it is part of it. To be a Christian is to hold traditional biblical views on the Person work and Nature of Jesus Christ. Trinitarians do that, Mormons do not.
Therefore, the view that there are 3 gods only united in purpose (the LDS teaching opposing the Trinity), excludes the LDS from being Christian because it denies the nature of Christ as being GOD incarnate (not just ‘a’ god).
And we haven’t even gotten to the OTHER heresies involving the Person, nature and work of Christ that the LDS teach.
Want a list?
OK ... a simple question: Who was Christ referring to in John 17:10?
by the way ... you remind me of Saul (earlier version of Paul). He also thought that ancient orthodoxy was beyond question or fault!