The first vid title is wrong. It is not christians persay that believe in getting the "holy ghost".
My best friend growing up went to a Pentecostal church with his grandma and it seems as though they followed more of the old testament than the new testament.
From what I gathered, they believed that before you could be baptized you had to receive the "holy ghost". I was there one time when someone started talking in tongues and stuff. It is pretty creepy. It is like the holy spirit coming over you to tell you that you are ready to be baptized or something......
One time when I went there I saw someone just start screaming and fall backwards; some people had to catch them.
They really get into it!