(To let you know, the analogy that I'm about to use isn't meant to be an exact analogy, just a logical stepping stone.)
Man makes a computer that is programmed to accept input and calculate outcome, much like God created man to do.
We make programs that it can interpret and thereby provide us with much entertainment by way of video games. when you're playing that first person shooter, there's a vast list of variables that the computer figures out that dictate color, position, damage, etcetera. These actual decisions are made separately and solely by the computer independent of the programmer. Yes, it was programmed to interact with the information in this manner, but it is the one interacting with the input, not the programmer. There are scenarios in the first person shooter realm (for instance) that have never happened. Hopefully (and usually), the computer will interpret this information the way it's been programmed to do, but it currently has the ability to, and does, this independently of, or apart from the programmer. Is the computer reliant on the programming originally given? Yes. You're very smart, but let me finish.
God made Man as a computer that is programmed (by way of DNA to name one of the obvious), and is able to program itself and can interpret, or choose not to interpret certain information. So, not only are we reliant on the programming we received from Him, but we are also reliant on the programming we receive from ourselves. This is why we are self aware, and this is why we are responsible for our own actions and thoughts. And this is ultimately why we are responsible for our own decisions concerning salvation.
You say, "yes but not everyone has the same knowledge of God." True, not everyone has it, but most start out with the same amount and the same capability to obtain it.
For those litterally unable to attain it, "...unto whomsoever much is given, of him shall be much required..." Luke 12:48
This implies that unto whom little is given, little is required. Those mentally or physically incapable of having heard, little is required of them.
Anyone who has read this and, not who understands, but who is able to understand it and chooses not to, will be held accountable for it.
Peace out.