A church is a congregation of sinners. If Christ lives in us, He lives in the church. Which brings us back to your original claim where you said that Catholics are not Christians. Again, who made you the arbiter of who is a Christian and where Christ lives?
>> “Again, who made you the arbiter of who is a Christian and where Christ lives?” <<
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In Acts, Stephen reveals that he does not live in temples made with hands.
Christ lives in the hearts of believers, called His church. They are individuals who make up the body of Christ...spiritually, not physically.
Once one is born again, one is no longer a sinner in God’s eyes but is counted righteous by what Christ did on the cross. They are saints in His eyes and are welcomed into His kingdom to fellowship and live with Him for eternity.
I am the arbiter of nothing.