I am from a small village in East Europe. As a kid I knew that religions exist. I am pretty sure that I haven't met a religious person until my early 20'. That was in Luton, when I landed in the UK. Saw two women in burqas with their owner, looking a like wizard from a fairy tale. Thought that they were wearing costumes, thought that this was long gone.
We had Christmases, Easters, etc, it just never had any religious undertone.