“If you had no Scripture, you would have no church.”
The Bible itself demonstrates that this is exactly backwards; the Church created the New Testament to document and standardise the central teachings of the pre-existing Church.
Actually, God "created" the New Testament and gave it by revelation to the churches. As for "the church" - without the NT, you would have no idea how "the church" was even supposed to function, etc. without it. This is because the churches and the Scripture were instituted by the same source - God. God gave the churches the Scripture (which they already had in portion in the possession of the OT) so as to "standardise" their teachings - but the churches themselves do not authoritative determine what those teachings are - they only affirm correct teaching as it was found and revealed in the NT.
Without the Scripture, you truly would have a situation where no one can say what is right or what is wrong. Hence, you would have no churches that can act as the "pillar and ground", the affirmers and perpetuators, or the truth.