Which Spirit is the question. And you are wondering that anticharismatics exists.
I know we've spoken before, and this is not an anti-wolfwint posting.
You've hit upon a really important topic...
actual discernment of spirits.
It is not enough to say "I'm a thorough studier of the scriptures and what I'm seeing doesn't line up with what I think is right, therefore it is wrong". Same as it's not right to say "I think something is going to happen so I'll say it and call it prophecy".
There's a big difference between what we do
by our understanding and what God does
by whatever means he does.
Saul (before he became Paul) was a great studier of the scriptures and very bold in his beliefs, thinking he was right and therefore also justified in what he was doing. And it wasn't his studying or understanding of the scriptures that brought him to a clearer view. It was God actually moving that made the difference. That's when he knew, even though it went against everything he thought he knew.
That's what might have to happen before you could change your mind about some of the things you talk against. An ACTUAL move of God, not just a further investment in studying.
One of the obstacles I see in your path is the conviction that "Those things don't happen anymore!". Which is actually a statement of "I don't BELIEVE those things happen anymore." Or to say it in a positive-belief way "I BELIEVE those things don't happen anymore."
Right now it seems you operate on what you believe and understand. And you keep meeting people that tell you of things that happen that don't fit your current beliefs. (Like speaking in tongues and the associated gifts of the spirit). Based on your understanding, these things "must" be wrong and therefore must be spoken against.
And the people that tell you these strange things also are operating on what they believe and understand. So there are two groups, each studying and each operating on what they believe and understand. Arguing doesn't seem to convince either party. So what can be done to make it obvious which (if any) is right, and which is in error?
The answer: invite God to move and make the truth known, even if it goes against what the person/people currently believe and understand.
That's what was needed in the Old Testament when Elijah confronted the 450 prophets of Baal, and that's what was needed in the New testament when Paul was confronting the (Holy Ghost baptized) followers of Jesus. And I would suggest that is what is needed today to separate between the beliefs and understandings of men. Which doctrines, actions, beliefs does GOD actually support? It will take God moving to show that. Or to put it scripturally "The Lord working with them, confirming the word with signs following".
That's part of the reason the bible states "These signs shall follow the believers...", to let us know that God will back up his word, with his actions.
If you, or anyone else, actually wants to know whether any spirit IS or ISN'T of God, you won't be able to rely on your beliefs and understanding...otherwise you could be persecuting TRUE Christians, as was Saul. It will take seeking God until HE MOVES to get it right. Which is also the only way that discernment of spirits, prophecy or any other spiritual gift ever actually work correctly...in the Old Testament, the New Testament or now.
Love in Jesus,
Kelby