And while he was preaching, the Holy Spirit fell upon them all. It was quite a shock. Over and over again, the same question. It's not an easy question. Christian Serbs plant land mines to blow up Moslem children.
Christian militia arm themselves to kill all the darker skinned races in America.
When Peter saw that the Holy Spirit fell on them, he baptized them. Some people think it means speaking in tongues, and in one sense they may be right. The clearest sign of the baptism of the Holy Spirit may be the gift of tongues, but that may not mean the kind we see in certain charismatic churches. I've seen that kind of speaking in tongues faked, more than once. But what Peter saw could not be faked.