1. Do you believe it's a choice to believe in God? Why/why not?
Yes/No. There is such an assortment and discrepancy of gods, belief for the most part comes down to geography and you dont get to choose your parents or where you are born so those early beliefs are not of your choice. As you mature you can question those beliefs so yes you can chose to either continue those beliefs or alter those beliefs or give them up altogether.
2. With the alternative option being (whatever general idea of) Hell, is it then a choice to love God? ie. choose to love God and go to Heaven or choose not to love God and go to Hell.
Love me or be punished for all eternity....well some people may enjoy sadomasochismbut I doubt it is for everyone. Why would anyone love a all powerful entity that maintains a place such as hell when it would be within such a beings ability to allow circumstance to preclude such a place at all.
3. Does free will exist in Heaven? Are we free to do as we please?
First define free will and Heaven. Once we have that construct in place I'm pretty sure people could come up with scenarios that would demonstrate free will as meaningless conjecture. Think of it this way, what if my free will precluded your free will?
4. Does God interfere in our reality in any way?
The concept of a god does, think 9/11, anti gay bigotry, killing abortion doctors, Muslims vs. Christians, Catholics vs. Protestants and so on and so forth.
Thanks guys.