My son is a Tiger cub (had his ceremony for his Tiger badge last week). His mother and I are Atheists and have been talking about this subject since he brought home that first Cub Scout handout from school.
Now to be fair I never had a personal problem with the cub/boy scouts. I disagree with the ideology but everything outside of that seems great. I actually think the boy scouts represent religion with more public good than most churches.
My son is only 7 and he loves the scouts. His friends are there. His Den leader knows we are Atheists and has even offered a compromise on his upcoming faith badge.
The problem I have is that I don't want my son to get too attached to scouting. I know in Weblos or the Boy Scouts he will be rejected. He doesn't quite understand that yet, but I tried to explain it to him. I honestly don't think kids can make religious or faith-based oaths, even Atheistic ones. I've never discouraged him from exploring religion but I also haven't taken him to church since he started school.
If anyone on here has encountered Atheist cub scout parents I would love to hear from you. I'm not against scouting, I just know the reality of his future in scouting.