Eph. 1:17-19 doesn't quite match up with what you are saying here.
"That the God of our Lord Jesus Christ, the Father of glory, may GIVE UNTO YOU THE SPIRIT OF WISDOM and revelation in the knowledge of him: THE EYES OF YOUR UNDERSTANDING BEING ENLIGHTENED; that ye may KNOW WHAT IS THE HOPE OF HIS CALLING, and what the riches of the glory of his inheritance in the saints, And what is the exceeding greatness OF HIS POWER TO USWARD WHO BELIEVE, according to the working of his mighty power."
It is only through UNDERSTANDING His Word that a person can KNOW that what they hold is in fact TRUTH. And notice also, that the Spirit of Widsom and revelation in the knowledge of him is given to you BY HIM. NOT by your Church, or your doctrines, or your traditions. It is through His Word that a person understands and knows what is the hope of his calling.
Believing you know the truth is like me believing satan knows the truth, which I don't believe
The Holy Spirit does not give everyone all of the gifts but none receive any of the gifts without faith.
“But the manifestation of the Spirit is given to each one for the profit of all: for to one is given the word of wisdom through the Spirit, to another the word of knowledge through the same Spirit, to another faith by the same Spirit, to another gifts of healings by the same Spirit, to another the working of miracles, to another prophecy, to another discerning of spirits, to another different kinds of tongues, to another the interpretation of tongues. But one and the same Spirit works all these things, distributing to each one individually as He wills.” - 1 Corinthians 12:7-11:
God, infinite and infinitely perfect, is beyond the capacity of humans to fully understand. Faith is the acceptance of things not understood.