Here to raise up is an idiom for causing someone who has died to become alive again. You can translate this in an active form. Alternate translation: "We know since God brought Christ back to life after he died" (See: [[rc://en/ta/man/translate/figs-activepassive]] and [[rc://en/ta/man/translate/figs-idiom]])
Here "death" is described as if it were a king or ruler that has power over people. Alternate translation: "He cannot ever die again" (See: [[rc://en/ta/man/translate/figs-personification]])