No.
You will have a silver membership after the gold membership has ran out. You will still be able to download demos and stuff, but not play multiplayer with others. So yes, you can still play Minecraft even after the membership has ran out.
No, the Xbox version of Minecraft is for Xbox360
no.
An Xbox 360, and enough points to buy it on the store.
No, you do not need xbox live you only need the points to play minecraft (1600-$20)
Xbox live yes
no you can not
Yes, all content on the Marketplace needs either a silver membership or gold membership in order to download content, also remember that one needs a connection to the Microsoft's Xbox Live servers in order to use Xbox Live at all.
yes to play in any multiplayer games, yo do
No you can not play xbox on line with PC.
I believe no. i am a Minecraft pro on the PC version but i don't you need it. maybe for multiplayer. and minecraft is better on the pc.
Yes, as long as one has Xbox Live membership then he/she can play with others. You need to have Xbox Live Gold though to be able to play on multiplayer based games like Halo, COD and what not.