Does any/every form of lying violate the precept of "not-lying"?

What if one thought it wiser to tell a lie, because the truth could potentially endanger one's own life? For instance, someone might lie that they believe in a supreme being, in reply to a question being asked by their parents who have strong faith. This is a very sensitive topic in some cultures or countries, to the point that parents might kick their son or daughter out of the house. This is an example where the intention is to maintain personal security. Does this violate the precept of not-lying? Or, instead of being a lie, might this be considered like the "noble silence" that Buddha once exhibited when the listener was incapable of understanding the Dhamma?