Is there any Biblical backing for Christian Zionism?

Please feel free to reply in general, but I am concerned specifically about Christian Zionism in the sense that Christians are attempting to fulfill Biblical prophesy through human actions, mainly involving political and military support for the state of Israel, no matter how they treat the Palestinians. From my Christian upbringing and understanding (incomplete, for sure) of the Bible, it is God alone who knows the time of the rapture and never asked us for help. It is not by human intervention that the rapture is going to be brought about, but this is what I see as the goal in Christian Zionism.