I have no argument with Scripture, only your interpretation, as it is not sensible. The church cannot be the foundation of all truth, or truth couldn’t have existed until Christ founded the church. Therefore, the only sensible object in the phrase that the description can be applied to is God, since He and He alone preexisted the concept of “truth”.
Christ/God IS Truth. There is a difference.
The Church is the pillar and foundation of all truth - as Holy Scripture says. You can’t get a ‘whom’ from a ‘which’ in your interpretation. And, that’s just for starters.
The problem is that the way that is presented is that the *church* IS truth.
Scripture, God's word, is truth, which the church is responsible to support or uphold as truth, which is what a pillar and foundation do for a structure.
John 17:17 Sanctify them in the truth; your word is truth.