Why was the English Parliament concerned about James the second rule?

The English Parliament was concerned about James II's rule primarily due to his overt Catholicism and attempts to promote religious tolerance for Catholics, which threatened the Protestant establishment. His actions, including the appointment of Catholics to positions of power and his disregard for parliamentary authority, raised fears of absolute monarchy and a return to Catholic dominance. These tensions ultimately led to the Glorious Revolution of 1688, resulting in James's ousting and the establishment of William and Mary as co-sovereigns, reinforcing Protestant rule.