While questions, experiences, and struggles related to sex can most certainly
generate questions about faith... (we are holistic, integrated creatures after all)... we have to be careful of generalizing or oversimplifying here.
I don't necessarily defend a lack of knowledge
about other religions (I scored 15 out of 15 on Pew's sample quiz on their site), but neither do I see it as relevant to compare the (implied)
question «Do you identify with A religion (or
faith in God)» with «what is your general knowledge
about ALL religions», and presume this is going to
generate a meaningful result.