> It's not based on the Bible, it's based on where we know for a fact people actually lived under the Roman empire. If not just speculation based on a 4000 year-old mythical text, it's literal documented history.
It's the invocation of a 'promised land', which even Israeli government officials use as a justification for their actions, that is based on (a reading of) the Bible, despite Israel being nominally a secular country.
I don't think many dispute there was a significant population of Jews within the Roman Empire, many of which lived in the rough geographical area of present day Israel.
I am not sure how any sort of present day 'inherent right' stems from that.
> there was a significant population of Jews within the Roman Empire
Until they got murdered. The Romans also tried to genocide them.
There's plenty of room for debate about the legitimacy of Zionism, and about what (and when) a "return to Zion" should be. Such debate has been carried out vigorously for 200 years. But it has to start from agreement on basic historical facts, and rejection of non-facts founded in bigotry.
Israeli government officials are politicians and vary in perspective, but by and large the Israeli government is a big part of the "nasty colonial racist" part. Their perspective exists but is not authoritative, and it is becoming increasingly unpopular around the world (including among Jews).