In "To Kill A Mockingbird," the Mr. Radley is described by another character as "a foot-washing Baptist." This description means that Mr. Radley is a very strict Baptists. He is so religious that Mr. Radley believes that anything fun or enjoyable is sinful.
Non-religious music, dancing, and playing are all fun and enjoyable -- as such, Mr. Radley would view these things as sinful. Socializing of any kind would be considered sinful. Women, due to their connection to Eve, are also sinful "by definition."
As a result of her husband's strict religious views, Mrs. Radley is rarely seen outside. First, he likely sees his wife as sinful thanks to Eve's tempting of Adam in Genesis. Next, the world outside is a sinful one. Mr. Radley likely believes that his wife should stay inside, praying and contemplating the Bible. Therefore, there is no need for her to go outside unless absolutely necessary.
The same reasoning would apply to their son, Boo. Anything that does not glorify God would be viewed as sinful by Mr. Radley. Mr. Radley would most definitely frown upon his son playing outside, especially with other children. That is why Boo, like his mother, is rarely seen outside. However, Boo is clearly curious about other children and suffers from loneliness.
Mr. Radley's strict religious views have a great impact on the life of his wife and their son, Boo.
