Science however is completely different. If I put a pot of water on a fire and with a thermometer watch the temperature rise, do I have faith that the water will boil at 212 F? (assuming at sea level) No, I don't have faith, I have knowledge. Since that has been demonstrated over and over again, I can reasonably say that I KNOW the water will boil once it gets hot enough (given no other factors interrupt the heating process).
The same science that doesn't know how the big bang happened? What caused the first cause? Where did all that matter come from in the first place? Yes. There is no need for faith in science.
It's takes faith to say "I don't know what caused the big bang"? No, it would take faith to say that it was caused by an invisible man. When science lacks the evidence, it tends to admit that they do not know yet.
Scientifically wouldn't you call that a "cop out"?
Only as much of a cop-out as a detective walking into a murder scene and telling people he doesn't know who killed the man.
The big gaping wound in his chest, the evidence of a struggle and a missing wallet imply strongly that there has been a murder, but he does not yet have enough evidence to work out who killed him, but he can speculate that the missing wallet means it was a thief, the fact that there are tyre tracks nearby means that the assailant escaped by car and the cartridge nearby suggests he was shot. None of these speculations is based on faith, the detective has just linked the evidence together into a narrative that makes sense, even though it is incomplete and could change drastically as more evidence is found.
In our case, the origin of the universe is our murder scene, scientists are the detective and things like the universal redshift, the Cosmic Background Radiation, and the large proportion of light elements are the evidence he found at the scene.
EDIT: Oh and don't start stretching this metaphor to 'ah hah! A murder requires a murderer!' otherwise I'll stop using interesting metaphors and go for 'a geologist is looking at a cliff which has just collapsed, he analyses the erosion rate etc'