The truth is even after the Holy Spirit fell on them I don't think the disciples had good evangelical theology. They certainly weren't dispensational. They would not have understood the trinity, hell I don't know that any of us really do. They would probably not have understood atonement theory, had a proper view of eschatology, or ecclessiology. I don't think they would have understood soteriology in either a Calvinist or a Aminian way. We see Peter, the recognized leader of the church even practicing racism. We see the church practicing communism. We see them still attending the temple! They did not have their theology together.
What did they have? They had an understanding of what it meant to live the way Jesus lived, and an understanding of Jesus as the Messiah. And that was enough to not only found the church, but to turn the world upside down.
Perhaps in our pursuit of truth, we should be pursuing the truth in action as much if not more than the truth in our head.