Okay you will have to clarify that Paul was speaking about languages which are not know to people in the world today when he was talking about speaking in tongues. Here are my references.
Acts 2:4 - Began to speak with tongues Acts 2:6 - everyone heard them speak in his own language Acts 2:7-8 - Marveled, saying to one another, "Look are not all these who speak Galileans?" And how is it that we hear each in our own language in which we were born? Acts 2:9-11: Identifys the regions in which they were all from (vast differences of geography and culture)
I Corinthians 12:10-11 - Speaking in tongues and interpreting tongues, also mentions earlier the working of miracles. I Corinthians 14:6 - If I come to you speaking in a tongue, what does it profit? I Corinthians 14:10-11 - There are, it may be so many kinds of langues in the world, and non of them is without significance. Therefore if I do not know the meaning of the language I shall be a foreigner to him who speaks.. I Corinthians 14:18 I thank God I speak with tongues more than you all I Corinthians 14:19 yet in the church I would rather speak five words with my understand that I may teach others also than ten thousand words in a tongue.
Yes baptism in water baptizo in Greek which means Immersion. If you have a strong's concordance you can see which Greek word is used there in the original and we have thousands of copies of the originals.
Paul making a mistake about water baptism when he himself was baptized after seeing Jesus on the road to Damascus.
It is evident you haven't read the scriptures lin their entirety for you didn't know about Peter baptizing Cornelius and his family in water or Jesus' great Commission speaking about baptism, or those on the day of pentecost, or Ethiopian Eunuch the Philippian Jailer, or those in Acts 19 or those Paul baptized in Corinthians.
Instead of asking the question: "Water baptism and the indwelling of the Holy Spirit seem to go hand in hand, why the difference on different occasions?" You say "Paul was making mistakes and Acts isn't a doctrinal book book."
Hardly someone I would ever take seriously when it comes to scripture is someone cutting it up to fit a narrative.
And as for Peter saying baptism is not the removal of filth from the flesh he's speaking about the act of going in the water isn't for the physical cleanliness of the person but the spiritual as Paul talks about in Romans 6:1-4. That's why I'm very surprised you used that verse, many people against baptism stay away from it.
Hey friend, you're right tongues are different languages and if being spoken should be interpreted. Not everyone had the gift of tongues others had various gifts spoken about by Paul. If you would like I can give you exact verses for everything I said but it will have to be tomorrow.
In I Corinthians 1 Paul is addressing the division in the church. Notice Vs. 11 and in vs. 12 people were saying "I am of Paul, I am of Apollos, I am of Cephas (Peter) or I am of Christ." It wasn't that Paul didn't baptize, in fact he did baptize some of them. Notice in Vs. 14-16. He's not saying baptism wasn't important he was saying that whoever did the act of baptizing is not important. Lest people say "Well I was baptized by so and so" as if that meant more than being baptized by someone else.
Interesting you use 1Peter 3:21 because that is a confirmation of baptism. It goes right along with what Jesus said after His ressurection in Matthew 28:18-19.
And Peter in Acts 10 yes, witnessed the Holy Spirit falling on Cornelius and his household and then in Acts 10:47 says "Can any man forbid the water that these should not be baptized..."
Jesus says "not many days from now"
Acts 2:3 -then there appeared to them, divided tongues as of fire and one sat upon each of them.
Acts 2:38 - Peter one of the 12 who had been baptized of the Holy Spirit tells those listening to be baptized and they will receive the Holy Spirit.
Also if we're writing off the entirety of water baptism then what Philip (also one of the 12) does with the Ethiopian Eunuch in Acts 8 is totally uncalled for. Acts 8:36-38
As well as Jesus' Great Commission in Matthew 28:18-19
And what Jesus told Nicodemus in John 3:5
Lydia and her household, the Philippian Jailer and his household, and those in Acts 19 who were baptized again because they hadn't heard of the Holy Spirit.
I will say as well, that I have studied German, Korean, Russian, and French and not once was I able to know those languages without study in my 50 years. My stance has been because I cannot prove otherwise, that the miraculous gifts of the Holy Spirit stopped with the apostles, for they were the only ones that could pass on the gifts through the laying on of hands Acts 8:17-18.
I truly believe miracles still happen today for I have a 5 month old daughter and I'm an old man. I see life bloom in the spring and yield back in the winter, I see men healed through prayer and made alive again after a bout of depression. Only these interventions could be accomplished by the one true God. So it my understanding that miracles through the hands of a man have stopped for they were only there to prove the veracity of God and we all know who God is now because of the writings of his word IITimothy 3:16.
The indwelling of the Holy Spirit continues for all Christians who are baptized as Jesus states in Matthew 28:18-19 and Peter in Acts 2:38 (and elsewhere) and The indwelling of the Holy Spirit (Romans 8:9-17) Does THIS for us which is no small thing also (Romans 8:26) helps us in our prayers and also gives us the ability to produce the fruits of the spirit (Galations 5:22)