Are gifts evidence of salvation?

By leaving it out, you make it irrelevant. But God begins there. Salvation begins and ends with God. By ignoring the work of God, you misinterpret what the responses mean.
In every case, the gospel is shared, evidence of faith is witnessed, and only then are responses called for.

I don't misinterpret anything. My previous explanation was sufficient and by not including verse 37 has no bearing on the subject matter.

Of course it matters. There is deliberation and purpose in the order of scripture. Your whole argument is predicated upon it. You just didn't include enough in the passage.

Why do you always leave out Acts 2:37? In it is the evidence of the work of God to produce faith and is what led to the people's response and consequently Peter's answer.
The same thing happens in Acts 10 and with the Ethiopian eunuch.

I'm not going to go around in circles with you. Think/believe what you like.

Here is the text:

Acts 2:37
New International Version
37 When the people heard this, they were cut to the heart and said to Peter and the other apostles, “Brothers, what shall we do?”

Which of the 24 words in this verse implies that it was not their own response to hearing the words of Peter but an outside force prodding them to believe?

I'm not going in circles. I'm drawing a straight line:

Word of God preached...evidence of belief...response.

This is always the case. You can even find this pattern in the OT. See Isaiah 55:1.

Draw it somewhere else

All of it. Salvation affects the whole of the individual. When they heard this...faith comes by hearing...pricked in the heart...only God can deal at this level...what shall we do...their will was affected.
All this was the evidence Peter witnessed and he told them the appropriate response to the work of God in them.
There were way more than 3000 people there that day. He doesn't give the same instructions to those that mocked the proceedings. Why?

Is possession of physical supernatural manifestations of the Holy Spirit evidence of a saved status?
Example: Does the ability to speak or translate tongues "prove" you are in a saved state?

Your response is simply extreme human conjecture. You are reading your doctrine into the verse. No one would see Calvinist thinking in this verse, except someone predisposed to believe such rubbish.

On your question:

He doesn't give the same instructions to those that mocked the proceedings. Why?

Does this have to be spelled out for you?

Why would Peter "give the same instructions to those that mocked the proceedings". Because their hearts were hardened"

Not hardened by God but by themselves. Just as the following:

Mark 8:17-21
New International Version
17 Aware of their discussion, Jesus asked them: “Why are you talking about having no bread? Do you still not see or understand? Are your hearts hardened? 18 Do you have eyes but fail to see, and ears but fail to hear? And don’t you remember? 19 When I broke the five loaves for the five thousand, how many basketfuls of pieces did you pick up?”
“Twelve,” they replied.
20 “And when I broke the seven loaves for the four thousand, how many basketfuls of pieces did you pick up?”
They answered, “Seven.”
21 He said to them, “Do you still not understand?”

God did not hardened the hearts of the Apostles but their hearts were hardened.

Yet Jesus expected them to understand.

It's not conjecture at all. I showed a pattern found in scripture. It simply doesn't fit with what you believe.
I'm not a Calvinist because I believe God initiates salvation. It is clearly taught in scripture. Jesus Himself said no one would come to Him except the Father draw them. Romans 3 teaches that no one seeks after God. Given those scriptures, it is necessary for God to initiate with grace.
And I don't disagree that people harden themselves. In fact, it is the natural estate of man.
And it's poor form to mischaracterize someone because you can't defend your position from scripture.

I'm not a Calvinist because I believe God initiates salvation.

Here is the text again:

Acts 2:37
New International Version
When the people heard this, they were cut to the heart and said to Peter and the other apostles, “Brothers, what shall we do?”

Here is the definition:
conjecture
noun
: inference formed without proof or sufficient evidence
: a conclusion deduced by surmise or guesswork

There is nothing in this verse that you can infer that their consciences were affected by anything other then themselves. Your doctrine is forcing you to infer God as the guiding force not the scripture itself.

Hence human conjecture.

I showed a pattern found in scripture.

John 3:3, 7
3 Jesus answered and said to him, "Most assuredly, I say to you, unless one is born again, he cannot see the kingdom of God." ...
7 "Do not marvel that I said to you, 'You must be born again.'

1 Peter 1:23 having been born again, not of corruptible seed but incorruptible, through the word of God which lives and abides forever,

If I were given the ability to speak in tongues I had never known in order to communicate God's word to someone of His choosing, that only means that the Lord made use of me for His purposes, just as He did pharaoh, who was not saved.

Born again from above, THAT is the acid test for salvation.

MM

That is what the "I" in tulip stands for in Calvinism.
I - Stands for Irresistible Grace
Irresistible grace is the belief that God brings his Elect to salvation.

Welcome to their club.

What you have is apophenia, sparked by a desire to support a doctrine.

How do you believe one comes to faith?

The use of God given reason.

“Come now, let us reason together, says the LORD: though your sins are like scarlet, they shall be as white as snow; though they are red like crimson, they shall become like wool. (Isaiah 1:18)

“When he came to his senses, he said, ‘How many of my father’s hired servants have food to spare, and here I am starving to death!
(Luke 15:17)

For when Gentiles who do not have the Law do instinctively the things of the Law, these, not having the Law, are a law to themselves, in that they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them, (Romans 2:14-15)

And many, many more.