The Boy Scouts of America was formed in the United States by William Dickson Boyce after meeting General Robert Baden-Powell the head of the Scout Association. It is unknown if General Robert was a Christian, but he was a Lieutenant-General in the British Army. William Dickson Boyce was a Presbyterian along with working with the newspaper and an entrepreneur.
Yes, the founder of the Boy Scouts was a Christian back then when the group was formed most people were Christian. Part of the Boy Scout Oath stated ,do my duty to God and reverent, meaning anyone that did not believe in God could not be a member.