Believers have the Holy Spirit in them wherever they go whether its at work, home, a church building, neighborhood etc..... Wherever believers are gathered together they are the church, in your home bible study groups, growth groups, when I have people over that are believers at my house, at my work ( 3 owners are believers ) and we talk about the Lord every day. So as the OP says God no longer dwells in any building made by man as that ended when Jesus was crucified and the veil in the temple was torn in two. So whenever you meet with another believer you are the church. And when you are alone as a believer with no other believer, you are not alone for the living God dwells in you through His Spirit, God is with you 24/7. He is not only Omnipresent but also lives in you. I believe if we all as christians were conscious of this we could turn the world upside down and as Jesus said all men will know you are My disciples by your love. Out life would be a testimony and we would not grieve the Holy Spirit. We would be walking in the spirit not carrying out the desires of the flesh. We would not quench the Holy Spirit but be filled with the Holy Spirit as Paul puts it in Ephesians , Galatians and Thessalonians.