Sister, I would not questioning that speaking in tongues is for today, if people would teach it as it is written in 1 Cor. Or at any other letter in the NT.
But it is not!
According 1. COR. 12, every believer is getting a spiritual gift, when he became a child of God. And this is not conditioned on a different expierience!
https://www.learnreligions.com/assemblies-of-god-700144
See point 7 and 8.
Where it is written in the bible?
That there is a different expierience needed, for to get the gifts?
And where it is written that speaking in tongues is an evidence of it?
You may now take Acts 2,8,10 and 19.
But you know that Acts is an report from Luke to Theophilis and contains the history, but less teachings. Acts 2,8,10 and 19 are a reportvof special events.
While you can find in Acts 15 some teaching about that what gentiles should do in different to the jews.
If you dont have the book of Acts, you would have non base for the teaching that speaking in tongues would be the evidence that somrone is baptised with the Holy Spirit.
So this is man made doctrine, but not what the scripture teaches.
That you can find in 1.Cor.
And anyhow after the apostolic time this gift of speaking in tongues disappeared in the churches. Till Montanus build an cult (in around 160) with even the vanished gifts of the apostolic time. And thats why many believed that is from God. But montanism was a cult.
And when the pentecostal teaching came to germany in 1907, many believed that is from God first, but then found out that it was not.
Why? There were events which you can found in spiritism.
iIn the churches of the churchhistory after the apostolic time the Holy Spirit gave these gifts obviously no longer, to the believers as he did in the apostolic time.
Today we see that through the pentecostal and charismatic movements these gifts are available in nearly all denominations.
With this many false teachings came along.
So my conclusion is, if the gift of speaking in tongues would be for today the Lord would not use false teachings. And these gift would be given independ in which church/denomination the believer is.