I must add that the term "Zionist" when used by non-Jews does not mean "Christian Zionist". Biden or Bush or Trump or countless other pro-Israel people all over the world are not Christian Zionists. They are just Zionists meaning that they support Jewish supremacy and Jewish right to colonize, plunder and ethnically cleanse. This is the position held by many people for one simple reason: they believe in human hierarchy that certain humans are inherently better and more deserving than others and should dominate and own less worthy human beings. Unfortunately this is a very popular ideology in the West and in the colonized minds in African and Asian countries.
Not all of us have evolved beyond Iron Age and tribal survival at the cost of others.
That is why these people support Israel. They see it as a beacon of White superiority over savage hordes.

And of course the decades-long indoctrination into Gentile guilt and the need to atone for Gentile sins against "Jews". Israel for them represents Jews because "might is right".
Biden and other American, British, Australian, Canadian, New Zealand and European politicians all support Zionism and are Zionists also because Zionist billionaires and moguls pay for their luxury, political career and privilege. Corruption.