Wrong. The original document states that non-Jewish Palestine would remain unchanged and that their rights would not be undermined.
The second part of your comment is true, but it went both ways, and was happening since 1920 when Britain tried to resolve land claims with the British Mandate of Palestine. The State of Israel did not accept this declaration. Israel then only gave full citizenship to those that denounced their Islamic faith, which sparked further tension in the area. This all led to civil war and then to the Arab-Israeli war of 1948.
It was the Arabs who didn't accept the British Mandate or the Israeli independence... Their rights were not undermined, they were given the same citizenship as the Jews... If Israel forced the muslims to abandon Islam, then why are they still muslim?! It is a complete falsehood to suggest Jews made them quit Islam...
The document doesn't state that "non Jewish Palestine would remain unchanged." Rather that in the newly proposed "national home for the Jewish people," there be nothing that "may prejudice the civil and religious rights of the existing non-Jewish communities..."
https://en.wikipedia.org/wiki/Balfour_Declaration
These replies are full, so I messaged you on steemit.chat