The Dilemma of Conscience

Yesterday a topic came for discussion. What was it about, what was the conclusion .. off the subject, yet it led me to think or probably awaken something that has been haunting always ..
What is right and what is wrong ? And who has decided it and if he/she/it was worthy enough to do that ..
Religion talks about it all the time but probably in the this crowded earth, so are the religion. As a kid, i was told that every religion leads to same things .. yet as I go deep, it seems kind of hard to believe .. and for a moment if I believe this fact, I find it hard to gulp that all religion says quite controversial to each other verdicts, can lead to same thing .. or one possibility is that the religion(s) as well has been affected by the mighty time and the core of it slowly started getting poisoned.
No religion, at least in the current form, is able to get my attention, though all of them gives me philosophical opinions of the religious book authors and its very interesting to argue on those, as those ideas have affected, consciously/unconsciously quite a bit of population.
Anyways, The real dilemma for me to judge what is right and if there is any absolute idea in it to believe in. As far as I know, I have been told by inner and outer world (myself) that lying is wrong and saving someone is right. Now, if the situation is lying is needed to save someone, something, will that lying be right or wrong ? or is there a preference in choosing the righteous act ?
Assuming my conscience call, I'll assume lying for saving would be a right act (depending on situation), but then dilemmatic argument would be -> it should not be something based on preference but should be absolute .. as in case of preference, there should be someone who can actually judge which is preferrencial .. ?