[count-your-change]

First since the book of Acts was not divided into chapters at the time of writing chapter two should not be considered as separate in some way from chapter one but simply as a continuation of it.
At the beginning of what we call chapter one the baptism with spirit was promised to the believers and at the beginning of chapter two 120 believers received holy spirit as visibly evidenced by the “tongues of fire” and the ability to speak in the foreign languages of those from outside Jerusalem as were named.

After Peter's speech explaining what was happening “about three thousand souls were added”, became believers also.

So obviously the ability to speak in tongues was a gift to serve a practical purpose at the moment and not a requirement of salvation.

[Laissez-faire capitalist]

And so it would seem that we are in agreement that Baptists (and some others) are incorrect when they say that the body of Christ was formed or born on the Day of Pentecost.

The church, the body of Christ is made up of believers. We know that at least 120 were believers as at least that many saw Jesus ascend into heaven, had accepted Him as messiah, Lord and risen savior days before the Day of Pentecost.

Thus even before the assembled believers spake with tongues on the Day of Pentecost, and even before the 3000 were saved, the body of Christ was already formed, already born and already in existence.

Thus, what occured to the Apstles, disciples and those assembled together in Acts 2:4 (at least 120) was a subsequent, distinct act to their salvation.

They were not baptized into the body of Christ on the day of Pentecost. The Body of Christ wasn’t formed or born on the Day of Pentecost. They were already baptized into the body of Christ, were believers, were saved, and formed the body of Christ BEFORE Acts 2:4.