I don't know just how it started, but it has been dramatically effective. I did not get saved in an altar (I was saved at the pew), but so many HAVE been saved that way that it cannot be discounted as an instrumental part of the (at least) American evangelicalism.At some point, there was a slow move from the traditional altar call...to just coming forward and standing around the front. The pastor might walk through the people praying for them, or it might simply be the people stood and prayed. Nothing wrong with that...except I think that this come to the front thing likely began when pastors would give the altar call, no one would come forward, so an general call the front took place. It might have also been a way of making it easier for people to come forward that would not have come forward otherwise.Along with coming forward, pastors began to do the Sinner's Prayer thing. Used to be, when people came forward, it was organic/authentic in the way they reached out to God--and utterly effective. I have seen people come to the altar, needing to pray through, and someone waste the moment by spending the entire time talking to that person. (In a Baptist Church I visited, it was an exceptional service, and people came forward, weeping, to be saved. But upon kneeling, immediately a deacon/deaconess(?) would get them to stop praying while he/she showed them scripture after scripture. It was a largely wasted effort, as the chance for true connection to God passed by.Even at Camp Meeting (I'm speaking of Wimauma, Florida, as I know precious little about the others), it used to be that after a service, the altars would be in use for HOURS, often until the wee hours of the morning, as people continued to pray. Today, we usually walk forward and pray (some may kneel on the steps of the platform). It's just went that way for some reason. Still great services, but no altar call, for the most part.In my own church, the people had gotten out of the habit of going to the altar. Also, I am a very poor hand at giving an altar call. For a while, we'd do the whole come to front and stand and pray thing. But I finally told my congregation that I am going to be in the altar every service. If no one joins me, fine. But I'm praying. And I do. And they join me. After altar time, I usually ask if anyone wants special prayer, to which 10 or so of the neighborhood children respond most of the time. I don't know what they want, but they must want something of the Lord, and HE DOES KNOW. Also, their parents--most of whom are not saved--will sometimes accompany them.