we are coming from quite a different perspective (non religious), but our DD began asking questions about religious beliefs very early on, so i've spent a lot of time thinking about this with her. and fwiw, i've found these conversations to be among some of the most amazing and rewarding i've had with her.
like most things, i think the main thing is to simply keep the channel of communication open. we've done thought experiments with her about some of the Big Questions and we've found that exploring alternate endings (beginnings and middles, too!) to some of the traditional religious stories have led to incredibly interesting conversations.
all the best to you!