Creationists, is the belief in creationism a matter of salvation?

Is it a salvation issue? I would not necessarily go that far. However the danger as I see it is this. If we start deciding parts of the Bible are not true. The how long is it before we start rejecting more parts of it. How long before we decide this command is irrelevant. Or this part does not make sense. I am sure some atheist will say I am making a slippery slope argument and I would not disagree. But I see it as a slippery slope. Once we decide to reject one part how long before the rest follows?