Um it might be ok.You could also include in your reasech the changing views in Christianity about issues past and present, such as the gay debate, sex before marriage, abortion and contraception. And maybe the why the attitudes of Christains themselves, teens and young adults have changed. Just a suggestion. You just have to make sure that there is secondary research done already on the topic and that primary research will be easy to obtain with good research methodologies. From what I’ve been told, there should be cross cultural element, and that you can talk about not only the fundamental course concept (society, culture, persons, time ect) but others, like change, continuity, globalisation, values, gender and beliefs.
You probably know all that, coz it has been drilled into me by my teacher. If in doubt, wait until you go back to school and ask your teacher. I'm still fine tuning my topic too. Its harder than I anticipated. Good luck!