I am not anti-Catholic, I am pro-God.
And I do not believe any particular doctrine or tradition of men has the whole Truth and nothing but the Truth.
The very thought of it is ridiculous to me - because mortals can never see "all that there is" from God's perspective - only what He wants us to know.
I expect to see lots of different "labels" in heaven!
More directly, to the challenge posted, i.e. how to know a person is led of the Spirit, I propose these might be good questions to ask ourselves:
Is anything as important as God (Father, Son and Holy Spirit) to me?
If I had to give up every loved one, every possession, every thing - right here and now - would I have any reservation or hesitation?
Who do I believe?
Who do I trust?
Do I love those who hate me?
Do I love everyone else, both in word and in deed?
What do my words - and especially my actions - say?
Is anything as important as God (Father, Son and Holy Spirit) to me?
If I had to give up every loved one, every possession, every thing - right here and now - would I have any reservation or hesitation?
Who do I believe?
Who do I trust?
Do I love those who hate me?
Do I love everyone else, both in word and in deed?
Excellent questions that perhaps all of us could and should ask of ourselves. But how do they show that the Holy Spirit is alive and well and living in us?
With the exception of belief in the Trinity, I'd say that Mahatma Gandhi was a much better Christian than I am. And I'm sure that there are people who act much more grossly than I do that are better, and those who act more piously are worse. I'm sorry, but I don't see the answer here.
"The very thought of it is ridiculous to me - because mortals can never see "all that there is" from God's perspective - only what He wants us to know."
Indeed. And He was very clear. He created the seven Holy Sacraments for us, because He wanted us to be saved. He gave us His only Son, who is God Himself, together with the Paraclete, because He wants us saved.
Thus we have Baptism, by water, blood or desire. We have Holy Orders through the Apostolic Line, created by God. They administer the Confirmation that we are, indeed, soldiers of Christ as the Church Militant. He instituted the salvic Confessional or Reconciliation where we may, through the Apostolic powers be forgiven our transgressions. The Holy Sacrifice of the Eucharist where Calvary is daily given to us anew. In our final hour, He gives us the comfort of Healing in Extreme Unction and for those of us called to the marital estate, we have Matrimony.
In the Seven Sacraments we find Eternal Life, Forgiveness, governance of the family and the Church, healing, enrollment in His Army and the Sacrifice that sets us all free.
Deo Gratias!