Are the Christians who were killed in Palestine by the Jews martyrs, and can they be called brothers to the believers in accordance with the Almighty’s saying: "The believers are nothing else than brothers"?

Whoever dies upon a religion other than Islam is a disbeliever and will abide eternally in the Hellfire. Dozens of Quranic verses and prophetic hadiths attest to this, including the Almighty's saying: ﴿Indeed, those who disbelieve and die while they are disbelievers - upon them is the curse of Allah and the angels and all of mankind.﴾ [Al-Baqarah: 161], and His (peace be upon him) saying: "By Him in Whose Hand is the soul of Muhammad, there is none among this nation, whether a Jew or a Christian, who hears about me and dies without believing in that with which I was sent, but he will be among the people of the Fire." Narrated by Muslim. Christians and Jews are disbelievers and polytheists. Whoever among Christians is killed is not considered a martyr, because martyrdom is a great status, exceeding the status of the righteous. It is not permissible to call Christians "brothers of the believers" because they are disbelievers, and their disbelief in Muhammad (peace be upon him) means their disbelief in Jesus (peace be upon him), because the prophets are a complete chain, so whoever disbelieves in one of them has disbelieved in all of them.