Although I am now a Christian, as a child and young teenager I was not an active Christian, although I was a theist. At age 11 or so I went along to the Woodcraft Folk. Which was a lot of fun and was really because my cousins sent.
www.guardian.co.uk/commentisfree/belief/2009/jul/01/atheist-camp-woodcraft-folk-dawkins
My daughter now goes to Brownies and if there were the option to go to the Girls Brigade locally, which is a more overt Christian group for girls, I would choose that. But there is, as far as I know, no Girls Brigade and no Woodcraft Folk in my area.
My point is really that if lots of parents objected to any slight religious content or religious requirement in the Guides or Scouts could they not join a totally secular group and start one up? Just as if I objected to the lack of religious content in the Brownies then I could try and start a girls brigade group in my area.
If Guides want to change their rules as to who can join it is fine by me.
I can see why parents might feel unhappy about the fact their children could not get into the local Scouts etc and in some ways I feel the requirement is not really worth so much. However, for me what may be worth more is the involvement in local activities like the Christmas Christingle service. What if atheists objected to this being on list of activities?
According to dear old Wickipedia there are already some Scout groups that omit the promise to God anyway...
Under the heading 'Non-WOSM Scouting'
en.wikipedia.org/wiki/Scout_Promise
"Scout sections that follow traditional Scouting, such as Baden-Powell Scouts within the World Federation of Independent Scouts, use several promises including the original Scout promise above that includes the reference to God.[8] Some, however, for example the 1st Tarrant Scout Group in Fort Worth, Texas use a blend of the original promise[9] and the "Outlander Promise" which, "according to tradition", B-P wrote for Scouts that had to omit the reference to God or a monarch for reasons of conscience."