A gathering of believers regardless of number for fellowship is a local church. It is a fellowship with God the Father, God the Son and God the Holy Spirit.
A gathering comprising of believers and unbelievers no matter the combination is a mixed multitude. It is not a church but a fellowship with demons. A mixed multitude cannot please God. It is a strange marriage of incompatibles.
God is one but functions in three Persons. The Holy Spirit is equal with and represented in God the Father and God the Son. He is omnipresent, that is, everywhere present. God the Father and God the Son are ordinarily domiciled in heaven. Since the Day of Pentecost when the Holy Spirit took over divine operations on earth on behalf of the Godhead the Holy Spirit has been busy building the Body of Christ.
In consequence, therefore, the Holy Spirit indwells two specific places on earth: regenerate mankind through the implanted Hypostatic Chips and His presence represented by a unique spiritual CANDLE wherever two or more carriers of Hypostatic Chips are gathered in the name of the Lord. “For where two or three are gathered together in my name, there am I in the midst of them.” (Mt 18:20)
At the fellowship of the original Apostles of the Lord, they ensured that only those bearing the mark of Christ were in attendance. They took steps to prevent ungodly men from creeping in unnoticed when they gather for fellowship. Also, they took time to invoke the participative communion or companionship of the Holy Spirit at every of their meetings.
The comfort emanating from the participation of the Holy Spirit in their meetings was noticed and enjoyed by all partakers. It was the main source of spiritual edification and unity of the Body.