The Problem of Belief

Here's something that calls out for an explanation and no amount of Bible verses will help. What is the content of salvific faith (i.e. the kind of belief that saves a person)? What must someone believe to be saved? Simple? Not so fast. A child who confesses Jesus is lord is saved, right? I dare anyone to ask a ten year old what she thinks of Jesus, what it means to say he is lord, whether she thinks he is God, God-in-the-flesh, the 2nd person of the trinity, or a really really big guy, and so on and so forth. Ask her to define each of her words. Anyone can say "Jesus is lord" then. Does doing so save a person unless said person has the correct detailed theology that goes with it? There is no doubt in my mind that a child holds to heretical ideas when asked about them. OR, she's expressing words she has no clue as to their meaning. But if so, then there are surely professing Christians of all ages, probably most of them, who think they are saved but are not, and this could be........YOU! Since this must be the case if one is saved by faith, this is a barbaric way to base a person's salvation upon--that not only must believers express the right words but also have the proper understanding of them.