Yes, the Holy Spirit is in us, but He isn't only in us. And that is the problem with what you are asserting. As has already been said, God is not limited to any one location, He is omnipresent; present everywhere at once. He is both in us and among us.
Notice the difference in John 17 in how the world receives spirits after a sign that they can see BUT the real indwelling Holy Ghost is the only means on how we will know Him as apart from how the world knows in receiving spirits. Not once did Jesus ever gave tongues as a prayer language to be used as a sign that you will know the Holy Spirit by. BUT Jesus did say the difference between how the word knows spirits in their comings and goings with signs, and the knowing real Holy Spirit by His dwelling within you forever as promised for all those that come to & believed in Jesus Christ at their salvation.
More proof?
1 John 4:1Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world........[SUP]4 [/SUP]Ye are of God, little children, and have overcome them: because greater is he that is in you, than he that is in the world.[SUP]5 [/SUP]They are of the world: therefore speak they of the world, and the world heareth them.[SUP]6 [/SUP]We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error.
1 John 4:4 draws the line of discernment in knowing the real Holy Spirit from those spirits that comes over a believer apart from salvation, even when those spirits brings tongues without interpretation when that supernatural tongue can be found in the world as 1 John 4:5-6 confirms, before Pentecost had come with God's actual gift of tongues of other men's lips to speak unto the people to hear the Word of God in their native tongue.