I'm struggling with a lack of faith. I don't believe half of what I'm meant to, I don't feel like I have a relationship with God, and I feel like a bit of a fraud. I have felt the lack of it for years now, and after deciding to 'fake it till I could make it', probably put it to the back of my mind. So I've in the meantime been doing my best to live like a Christian, and saying my prayers, going to church etc. I am excellent at 'following rules' but it feels like that's all I'm doing. 
It's become obvious that this has been going on for over a decade and it isn't working.
I so want to have faith, to have a relationship with God, but I don't know how to go about it. I see other people's faith and can only shake my head in wonder.
I obviously have to try another tactic, as this isn't working for me. I can't think about trying another religion (probably for cultural reasons as much as anything else). Any ideas?