Such acclimation efforts stink invariably of hidden agendas and dishonest tactics. With that said, it might prove a successful strategy of influencing her in acceptance of your atheism at least. Whatever you decide to do for the time to come, be careful with your intentions. It doesn't have to be an All-or-Nothing deal.
"The first principle is that you must not fool yourself — and you are the easiest person to fool." - Richard P. Feynman