The “Speaking in tongues” in Acts 2 by the Apostles of Jesus is VERY DIFFERENT from the babbling in tongues I hear from many churches today.
The apostles spoke in a KNOWN EARTHLY language they never learned before. For instance, if I don’t know Urdu, and I can suddenly speak it, THAT is the kind of miracle that was manifested in Acts 2.
What those who “speak in tongues” today tell me is that they are speaking in some unknown “heavenly” language.
The gift of tongues is not discussed in Acts 2, but I Corinthians 14, though I suspect you already know that :-)