Holy baptism

I don't know if I'm supposed to answer those questions, but I had something else about the Holy Spirit that I wanted to share...

Pentecostals talk about being slain in the Spirit and use Acts 2 to support their claims. They say that you can't be a true believer if you haven't "received," or been "baptized" by, the Holy Spirit. But at the end of Acts 2 "about three thousand souls" believed and were baptized (with water). In Acts 8, where Philip preaches to the Samaritans, they were "baptized in the name of the Lord Jesus" first (v. 16) and then later received the Holy Spirit. There is no mention of speaking in tongues, which, if this is a vital thing, you would think Luke would've mentioned it (but I guess you can't totally rule it out). Then, in Acts 10, "the Holy Spirit was poured out even on the Gentiles" (v. 45) before they were "baptized in the name of Jesus Christ" (v. 48). They spoke in tongues, but they hadn't been baptized with water yet.

there are numerous other instances in Acts where people put their faith in Jesus and are baptized with water, yet there is no mention of the Holy Spirit. The three above are the only mentionings of people receiving the Holy Spirit. So either they weren't truly saved, or being slain is not a key factor.

So there is no defining way into how the Holy Spirit works. Paul even goes into detail in one of his epistles as to how speaking in tongues works (don't remember the book off the top of my head).

Throughout scripture the Holy Spirit is describe as a guide. He guides the writers of Bible in putting down the words of God. Jesus states this and much more in John 16:

"Unless I go away, the Counselor will not come to you; but if I go, I will send him to you. When he comes, he will convict the world of guilt in regard to sin and righteousness and judgment: in regard to sin, because men do not believe in me; in regard to righteousness, because I am going to the Father, where you can see me no longer; and in regard to judgment, because the prince of this world now stands condemned.
"I have much more to say to you, more than you can now bear. But when he, the Spirit of truth, comes, he will guide you into all truth. He will not speak on his own; he will speak only what he hears, and he will tell you what is yet to come. He will bring glory to me by taking from what is mine and making it known to you. All that belongs to the Father is mine. That is why I said the Spirit will take from what is mine and make it known to you."

I believe the Holy Spirit works today as a guide, just like Jesus laid out above. Do people ever truly speak in tongues? Sure. But like Paul says there must be a witness who can interpret the event.