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Since the Church is called in Scripture "the pillar and foundation of the Truth" and Jesus Himself, foreseeing disputes, says to take your disputes to the Church for judgment...

You are misinterpreting the verse...It is God who is the pillar and ground of the truth...The church(es) will not be holy and pure and full of complete knowledge UNTIL they are presented to God

Please look at the verse itself.

God is not "the pillar and foundation of the truth." God is the Truth. The Truth Himself, tout court.

But what does this verse identify as God's "household" which "upholds" God's truth; in other words, what is identified as the "pillar" --- the useful structure that holds the Truth up, as a lectern holds a Book, as a lamp-stand holds a Lamp, which manifests and displays it?

1 Timothy 3:15
If I am delayed, you will know how people ought to conduct themselves in God’s household, which is the church of the living God, the pillar and foundation of the truth.
("Pillar and foundation" is an architectural term, meaning the same as "column and plinth".)

God is Truth; the Church, his household, holding Him up like a column and plinth, manifests and displays Him.