The difference is between God being a transcendent being "outside" us versus the Holy Spirit dwelling "inside" believers through an act of faith. "God outside a body" can refer to the traditional Christian view of God the Father as a personal Creator existing independently and governing the universe. "God inside a body" is understood as the Holy Spirit indwelling believers, making their bodies "temples of the Holy Spirit". Many faiths also believe God is present everywhere, both internally and externally, in a non-physical way.
God outside a body
Transcendent Creator: This view sees God as an external, personal creator who exists independently of humanity and created the universe.
God the Father: In Christianity, this is the common view of God the Father, who is considered distinct from humanity and exists in heaven.
Omnipresence: This doesn't necessarily exclude God's omnipresence. The idea is that the Creator exists outside of, and also throughout, creation.
God inside a body
The Holy Spirit: In a Christian context, this refers to the Holy Spirit indwelling believers, especially after accepting Jesus Christ.
Temple of the Spirit: The Bible teaches that believers' bodies become "temples of the Holy Spirit," a sacred residence for God's love, according to FaithGateway.
Guidance and guidance: Having the Holy Spirit inside is seen as a source of guidance, teaching, and direction from within.
Both perspectives
Duality: Many religious perspectives hold that God is both transcendent ("outside") and immanent ("inside"). Quora users suggest that God the Father may be "without" while the Holy Spirit is "within".
All-encompassing presence: Some faiths, such as Islam, believe that God is without a physical form and is present everywhere at once, working through all living things, Supreme Knowledge reports.