No, Halloween is NOT a pagan holiday adopted by Catholics and passed on to Protestants. That’s a myth perpetuated by anti-Catholics and those who, contrary to the Bible, fear what has been offered to pagan gods. So, in reality, Halloween is a safe and fun secular practice with Christian origins. If you don’t believe that, or dislike the type of Christian faith it originated in, follow Paul’s advice. If you don’t feel you can go that far yet, don’t complain about those who have a stronger faith.