For anyone interested, the citation for this verse is Luke 17:21. The NIV, KVJ, and D-R versions use this phrase. The RSV and NAB (and many others) do not. Instead, they translate it as “The Kingdom of God is among you / in the midst of you”. This translation correpsonds with the interpretation that the “Kingdom of God” is Jesus (which Pope Benedict XVI utilizes in his book “Jesus of Nazareth”

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I’m not sure what kind of discussion the OP is hoping to get going with his/her question. Yes, God dwells within us, but that doesn’t mean that self-enclosed reflection will lead us into all truth.
We have to look at the content and unity of all Scripture, not just pick one verse and run with it. And we can clearly see in other parts of Scripture where the keys are given to Peter and that the Church will be built upon him and the apostles (and their successors) have the authority to bind and loose, etc.