Just as the ‘church’ is the body of believers in Christ, so is the concept that the Holy Spirit only indwells a true believer. God knows the heart and only He can see if faith is genuine.
Church membership (meaning a particular religion) profits no one. We are assured of our place in heaven when we die because the Holy Spirit was given to us as a down-payment. We are “sealed” with the Holy Spirit and, as such, can never be lost again. Jesus said he would lose nothing and no one can pluck us out of our Father's hand.
Amazing to see the adjective “excellent” ascribed to post 81 (a poisonous and tarry ball of anti-Catholic hatred).
But your claim is informative on at least one level.