Maronites don't actually like Israel, they were only allies out of convenience. There was a poll on approval rating of international politicians among sunnis, shias, and Christians and the only thing they agreed on was hating Netanyahu.
Sure, today.
But in the 70s and 80s?
EDIT: And for that matter,
With the exception of the Maronites in Lebanon, Arab Christians hate Israel just as much as their Islamic countrymen. You know that some of the Palestinians are Christians right?
This is less straightforward than you present it as. Christians have always been a small minority of Palestinians, and getting smaller every day; a little under 6% of Palestinians are Christian, and they have lower birth rates than Muslims so this is going down. But even going back to the earliest available census (1922), only about 11% of inhabitants of the Mandate of Palestine were Christian (the census records only religion, and so some of those were Christians* who did not consider themselves Palestinian - though it's unlikely that many were). And, frankly, they do get along better with Israel. As an imperfect proxy, we see that among Jerusalem Palestinians (who are eligible for Israeli citizenship but often do not take it), Christians are disproportionately more likely to accept Israeli citizenship than Muslims.
Among Arabs in Israel, some of who identify as Palestinian, Christians are less likely to identify as Palestinian than Muslims, as well as more likely to identify as Israeli (the polls usually ask the questions separately, so that an individual could be both, either, or neither). Christian Arabs in Israel are wealthier and widely reckoned to be better assimilated.
Israel is said to covertly support Christian communities in Arab countries (and, for example, the Iraqi pilot who defected to Israel with a MiG 21 was a Christian) - though obviously that's much harder to show conclusively one way or the other.
Now, I'm not saying that all Christian Arabs love Israel, or even like it, or even don't hate it. I'm just saying that it's not really as simple as "[they] hate Israel just as much as their Islamic countrymen."
* Like the
Templers