This is an AFTER cross experience. A commandment from Jesus himself to the disciples.
Matt 28:19-20
19 Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
20 Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.
KJV

Did you not know This was told to them, just before that?
Acts 1:5 niv
"For John baptized with water, but in a few days you will be baptized with the Holy Spirit."
Jesus defined it for them! He did explain it. But, it did not sink in yet.
A ways down the road Peter finally grasped what Jesus was telling them.
Acts 11:16 niv
"Then I remembered what the Lord had said: 'John baptized with water, but you will be baptized with the Holy Spirit.'
Think! All that time Peter was water baptizing? He had
not yet remembered the words of the Lord telling him that water was to be replaced by the Holy Spirit! That's why there was so much water baptisms going on!
That explains why water was still used. For, they were still functioning as they were trained to do before the Church age began.
Didn't anyone tell you a new way to do something? And you kept on doing it the old way? And, when they saw you doing it the old way? You told them you forgot? Happens all the time! The disciples were caught up in a time of great excitement and awe when Jesus first rose. Their concentration was not at its best. For they were overwhelmed and overjoyed.
Luke 24:41 niv
"And while they still did not believe it because of joy and amazement, he asked them, "Do you have anything here to eat?"
Being in a heightened emotional state can cause one not to grasp what it is he is being told. Later on, the persoin will get it when he remembers and is in a stabilized state of mind. Like with Peter.
I think the real problem here is that you can not figure out how so many can be so wrong, and for so long.
Matthew 7:13-15 (New International Version)
"Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it. But small is the gate and narrow the road that leads to life, and only a few find it."
The mainstream church is "broad and wide." People just drift along and get nowhere. Same thing today as it was yesterday. The river of rightesousness flows in a narrow path and lifts one up and brings him to where God wants him to be. It requires being taken where you have not been before in your thinking.
Amos 5:24
"But let judgment run down as waters, and righteousness as a mighty stream."
Righteousness is not "broad and wide." Its strait and narrow. Mighty streams are not broad and wide. And, they are dangerous if you are not kept afloat (grace).
Acts 11:16 niv
"Then I remembered what the Lord had said: 'John baptized with water, but you will be baptized with the Holy Spirit.'
That's not for mainstream thinking. Its too much for them to handle. They fear jumping in and to find out where it will take them. For they desire the security of traditional thinking. And, when something comes along to prove the traditional thinking wrong? It feels threatened.
Matthew 16:25 niv
"For whoever wants to save his life will lose it, but whoever loses his life for me will find it."
That, in a nutshell, is the problem. Institutions offer security. Christ offers life and spiritual adventure.
Grace and peace, GeneZ