God publicly declared that He would put His Spirit within the human being.
If you practice Christianity and believe that God's gift to you is the Christian religion itself, then you need to hear this clearly: The Christian religion is not God's gift.
Christianity without the New Covenant is a man-made religion, because Christianity is the New Covenant.
Religion is a system built around an external God - approached through rituals, institutions, doctrines, and mediation. The New Covenant is not that. It is not humanity reaching toward God. It is God choosing to dwell within the human being.
Christianity is the New Covenant. Remove the New Covenant - remove God's indwelling - and what remains is not faith, but form. God's indwelling cannot be replaced by rituals, doctrine, belief, or religion.
When the New Covenant is replaced with belief, doctrine, or ritual, Christianity does not become incomplete - it becomes something else entirely. It becomes a man-made religion.
This is why many Christian believers are unaware of God's gift. Not because the gift was not given, but because their faith has been trained to look outward - to systems, structures, teachings, and practices - while the gift itself remains unopened within them.