A testimony is nothing more than a WFF (i.e. warm fuzzy feeling). Every cult and false religion (JW's, Muslims, Hindus, Christian Scientists, etc.) has numerous adherents who will sincerely claim this type of personal revelation. Some even sacrifice their lives based on it. Obviously, they can't all be right.
That is one of several reasons why there can be no substitute for hard evidence. Period.
How can Christ’s greatest promise have no meaning to you?
Re-read the scriptures because the presence of the Holy Ghost and a witness of Jesus Christ go hand in hand.
It’s not a warm fuzy .... it is the essence of Christianity itself.