However, I do believe OT saints had Holy Spirit upon them and NT saints are indwelt by Holy Spirit.
We are told in many places in scripture that old testament saints had the Holy Spirit in them.
1 Peter 1:10-11
"Of which salvation the prophets have inquired and searched diligently, who prophesied of the grace that should come unto you: Searching what, or what manner of time
the Spirit of Christ which was in them did signify, when it testified beforehand the sufferings of Christ, and the glory that should follow."
Isaiah 63:11
"Then he remembered the days of old, Moses, and his people, saying, Where is he that brought them up out of the sea with the shepherd of his flock? where is
he that put his holy Spirit within him?"
Numbers 27:18
"And the LORD said unto Moses, Take thee Joshua the son of Nun,
a man in whom is the spirit, and lay thine hand upon him; "
Exodus 31:1-3
"And the LORD spake unto Moses, saying, See, I have called by name Bezaleel the son of Uri, the son of Hur, of the tribe of Judah:
And I have filled him with the spirit of God, in wisdom, and in understanding, and in knowledge, and in all manner of workmanship,"
Daniel 4:8
"But at the last Daniel came in before me, whose name
was Belteshazzar, according to the name of my god, and
in whom is the spirit of the holy gods: and before him I told the dream,
saying,"
And so on, and so on, and so on...
Furthermore, as I said earlier, the new birth was available to old testament saints, and that involved God putting his Spirit within them.
Ezekiel 36:26-27
"A new heart also will I give you, and
a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh. And
I will put my spirit within you, and cause you to walk in my statutes, and ye shall keep my judgments, and do them."
Much of the so-called "church" has been propagating a lie for centuries, if not millennia. We would be wise to believe the word of God over the lies of men.