The "that" and the "how" can be a bit slippery.  The assertion if Christ's actual, substantial presence in the Eucharist is an assertion of a factual nature, a "THAT."  "How" he comes to be present, SUBSTANTIALLY, is, well, a "HOW."   

Transubstantiation is a fundamental belief, and has been for hundreds of years, probably since the Last Supper.   Whether or not this can be borne out is not the issue, however.  The fact remains that Transubstantiation is fundamental belief of hundreds of years, and draws together those who are Catholic.  Those not drawn by this belief should just acknowledge that they don't accept Catholic teaching.  But why should Catholicism abandon a basic tenet of the faith simply for the sake of unifying with those who reject a basic tenet.  The Church is what it is.  No one is forced to remain.

As for your use of the phrase "naming toward":  it's not self-explanatory, and I have no idea what you mean.  If it's jargon, remember we're mostly laymen.