What story is this?

Please don’t make this about religion, I just need the name of a story, not a lecture.

I have given up. I have no idea what to even search any more in Google. Anyway, I can’t find this story that I read a few years ago about an altar call and a boy. Basically, the boy was in a church at some kind of revival (New Year’s?) and there was an altar call when the pastor invited those who wanted to change their hearts. Basically, the boy went up and the grandmother was extremely happy.

When the boy got home, however, he did not feel like he was changed right away and he was distraught over the whole situation.

I can’t find this story ANYWHERE. I thought it was by Robert Frost or Mark Twain but I already looked in this areas…