Can prayer change God's perfect plan?

[FatAndFaithless]

I think some people are just having a hard time grasping the concept of being outside the dimension of time and therefore being able to see it all at once. Which is understandable, since we live within time and don't have the ability to comprehend a dimension that is outside of it. To us, it's past, present, and future, one moment happening at a time... and if we imagine someone "knowing the future" we imagine it means they know because they will control it, hence, we don't have free will. But there is a difference between that and someone being outside of time entirely and "knowing the future" because to them there is no future to begin with - they can see everything happening all at once.

Do you understand what it means to "be outside of the dimension of time"?  Or if that makes any real sense or if it's possible?  Or is this all just what you're (and Catholic doctrine) is asserting?  It's one thing to assert something and another to prove or demonstrate it.  

I'd like to see why you think it's possible to be outside of the dimension of time let alone that there is an entity already there.