On the lunacy of free will

[slartibartfast]

I think many Christians believe that free will is all around, but God does "tweaks" in the minds of other Christians who pray, and also does "tweaks" to the physical world in response to prayer as long as the prayer is consistent with God's plan.

So, the plan can get bent, but not really broken -- but only if you're a Christian.

This does not resolve any of the dissonance. Even assuming there is any logic to what you said above - one thing that you MUST have free will over is whether you believe in God or not. If this is not the case, then your path to heaven / hell would be predetermined. So how can anything be "tweaked" only for Christians, if God doesn't know whether someone is going to convert to Christianity, or stray from it in the future. 

One could argue that even though you have free will to decide, God already knows which path you take if he can see into the future, but that implies you DON'T have free will and the outcome is already determined, so this is a logical fallacy.