If "Truth: exist, it MUST be singular.
So there can be but One True Church
Why is your church the one? Or why is it not the One?
What IS is Truth. That might include the idea of church, or some variant, as there has been some sort of explanation for the Unknown called that, or religion, since man fell from animal instinct, or as that seems to have been called in your faith’s Bible, Eden. But the lesser cannot encompass the greater. There then cannot be a “true” church, only one that thinks it is, based on the bias of its members, who are also incapable of either containing the Truth or presenting any useful facsimile of it, especially as an intellectual proposition. There is no container for Truth
as such, as that to the human mind is incomprehensible. And one doesn’t have to go to a church to know that.
So it is on you to make a link between the singularity of Truth and the notion that there is, or might be, or could be, or needs to be, a church that is equal to it, or even hypothetically represents it, as Totality can have no useful representation, save perhaps, as very insufficient ad hoc pointers, “1,” “I AM THAT I AM,” or perhaps “1=0.” Any church is necessarily less than Truth itself. The OP proposition is a semantically null, and the question, as does the proposition, makes unwarranted assumptions.
It feels like, from other things you have posted, that you like to make grand assumptions that appear to have value of being proved in your favor. You claim to identify as your accomplishment in being educated on a kind of line of thinking which is not accepted by any means to be as Universal as you feel your claim to that is. Therefore the “shrug” is hubris.
And what do you men “If?”