“But had certain questions against him of their own superstition, and of one Jesus, which was dead, whom Paul affirmed to be alive.”
King James Version (KJV)
25:19 But had certain questions - How coldly does he mention the things of the last importance! And about one Jesus - Thus does Festus speak of Him, to whom every knee shall bow! Whom Paul affirmed to be alive - And was this a doubtful question? But why, O Festus, didst thou doubt concerning it? Only because thou didst not search into the evidence of it. Otherwise that evidence might have opened to thee, till it had grown up into full conviction; and thy illustrious prisoner have led thee into the glorious liberty of the children of God.
Ac 25:19 Their own religion. The Jewish religion.