well, there is a slight risk that you may end up with the one in a gazillion scout leader that is religious, but i'd say your chances are minimal, tbh.
you'd be hard pressed to find a woodcraft folk leader that wasn't, um, woo, though.
depends what you're after, really. nowt 'wrong' with either organisation, but if you want mainstream, go for scouts. if you don't do mainstream and find it all a bit threatening and scary, do woodcraft folk.
that said, if you really are talking about scout age children, and not beavers, it would be a really good idea to ask your child. becasue if your 12yo's mates are all going canoeing at the weekend and abseiling down buildings with the scouts, and you enrol him in the woodcraft folk, he might not be too happy. for 5 or 6 yo, it probably isn't too importnat.
have been a leader for both scouting and guiding, and everyone gets terribly tied up in knots about religion. i'm currently in canada, and the promise has been changed (and all of the songs etc) to be completely inclusive. i'm told the uk haven't yet, but i honestly don't think it will be long. the optional church parade is pretty much it.
so, mainstream, or woo? the choice is yours....
(i once accidentally found myself on a woodcraft folk email contact list. via a friedn who was a woodcraft folk leader. it was v interesting.
she apologised to me (unsolicited) as there is definitely a cultural difference...)