What is the best way to respond when a Protestant says the Spirit leads them into all truth… (basically claiming to be infallible)
No Protestant claims anyone alive today has infallibility. That’s one reason we aren’t Catholic! The Spirit does lead us and guide us. There are times when God does speak to us. There are gifts of prophecy, words of wisdom, words of knowledge, etc. However, no one is infallible, and both individuals and the church at large is responsible for discern whether someone is speaking in accordance with God’s word and revealed truth or is doing something else entirely.
Also another interesting heresy I have come across is protestants who say the Spirit is a Feeling (Usually unknowingly).
What do you mean by “unknowingly”. Have you asked them what they mean or are you assuming?
They say things like, “Did you feel the Spirit?”, “I felt the Spirit in that Church opposed to this other Church…”
I’ve never asked someone “Did you feel the Spirit.” That’s a pretty stupid question to ask and too personal to boot.
However, I have at times (a lot actually) felt the Spirit’s tangible, manifest presence. The prophet Jeremiah’s words come to mind, “his word is in my heart like a fire, a fire shut up in my bones. I am weary of holding it in; indeed, I cannot” (20:9). And that is exactly how I felt, so filled by His presence that all I could do was just rejoice in the God of my salvation and glorify His name.
We read throughout all of Scripture incidences where the Spirit was tangibly present and made Himself known. In the Old Testament, He filled the Temple with the Glory of God to such a measure that the priests could not stand to minister.
In the Acts of the Apostle, we read that the Holy Spirit came into the upper room like a mighty, rushing wind and tongues of fire descended upon the disciples and they spoke in other tongues magnifying God. Hearing, speech, and heat (feeling) all engage the senses.
Throughout Acts when the Holy Spirit comes upon someone the language used is “falling upon” or “filling” them. Saying, “the Holy Spirit fell” indicates sudden impact and “filling” indicates a complete absorption. Sure, the Holy Spirit can be felt. Our God is not a mute idol made from stone and wood. He is a living God, and He can engage with our senses and emotions.
I even had a person tell me in a Protestant Bible study not to correct another Protestant but let her interpret it by the Spirit and how she feels about it… Whhhaat? Then after the study he told me I was to pushy and that I needed to let the Spirit discern things individually for the person.
Sounds like you might just need to find a Catholic Bible study or at least a Protestant Bible study that is made up with people you can get along with. That would be my advice.