well... it is up to you what to do really.

some people do what they can to get their faith back...

other people find they lose their faith in god and they are fine with that. see it as similar to losing their faith in santa claws and such.

if you want your faith back then i guess it might be about spending more time with believers so you catch something of their faith (attitudes can be quite catchy)
if you don't... then i guess you spend more time with people who don't believe so you catch something of... where it is that they find peace and acceptance and all those things that you used to get from your faith in god.