Someone who has been beheaded in a ritual manner would have blood all over their clothes, someone whose head has been taken clean off by a piece of ordnance wouldn’t.
The clothes she is wearing are a complete red herring, this is Syria not Saudi Arabia, women wear normal clothes there. Look at the other people in the video they are all dressed in western style clothes.
The entire basis of your thread is specious and your title incorrect.
In no way, shape or form can these people, all civilians, who are mourning and lamenting the tragic deaths of multiple adults and children be described as gloating or in some way triumphalist. The dead girl, who is among several others is unlikely to be a Christian as the people in the video are all Muslims.
If she is a Christian, who as you claim was deliberately beheaded, who killed the others and why are the beheaders so angry and distraught?
Your post is wrong and you know it is. You should ask to have it taken down immediately.
Syrian rebels seize control of Christian village:
http://www.usatoday.com/story/news/world/2013/09/08/syrian-rebels-take-christian-village/2781763/
Al-Qaeda-linked Syrian rebel snipers haunt Christian town of Maaloula
http://www.washingtontimes.com/news/2013/sep/19/al-qaeda-linked-rebel-snipers-haunt-christian-town/
Brutality of Syrian Rebels Posing Dilemma in West
http://www.nytimes.com/2013/09/05/world/middleeast/brutality-of-syrian-rebels-pose-dilemma-in-west.html?pagewanted=all&_r=0
I don't think the men who is parading the little girl's body around is showing any respect for her.