I really feel that the bible thumpin' side of your family probably messed you up by being too forecful and matter of fact with their beliefs towards you.
You need to find who you want to be, and it's going to be very difficult.
I'd recommend, first of all, to read up on different cultures and different beliefs and form your own personal belief based on those.
There are some pretty good resources online, Wikipedia, as usual, is a good place to start.
I'd recommend checking out these beliefs in specific;
http://en.wikipedia.org/wiki/Theosophy (Sorry, if I referred to myself as being "Half theologist" I mean "Half-Theosophist. It's been a bad week, excuse me for it

Anyway, theosophy is one of the best and most underrated belief systems out there; based on the idea that all beliefs are important and "true" to an extent as they, along with art and creativity, are instances all man's pursuit of the divine).
http://en.wikipedia.org/wiki/Neo-paganism(Neo-Paganism is such a huge umbrella term it leaves you an immense amount of spiritual fredom in what you want to believe)
http://en.wikipedia.org/wiki/Buddhism(Another great religion that's not near popular enough)
http://en.wikipedia.org/wiki/Hindu(Hindu stuff is pretty cool; it's one of the "pagan" religion that still goes strong)
http://en.wikipedia.org/wiki/Shinto(If you're a japanophile, you'll love this one

Another pagan religion that's still going reasonably strong).
http://en.wikipedia.org/wiki/Bahai_faith(Kinda like the prototype of Christianity)
http://en.wikipedia.org/wiki/Gnosticism(Another Umbrella-ish term, but Alan Moore is one, and he created Swamp Thing and John Constantine, so it can't be too bad, right?)
And the "Major" Religions:
http://en.wikipedia.org/wiki/Christianity(Good article on the different types of Christianity)
http://en.wikipedia.org/wiki/Judaism(If you don't believe Jesus was the saviour

)
http://en.wikipedia.org/wiki/Islam(For Islam)