I don't like Halloween either. Originally it was wearing costumes and carving pumpkins to scare away spirits, and demons.
And it's based on, and emphasizes ghosts, demons, and other evil things. And being that I'm a strong christian, I believe in demons. In other words, it basically go's against what I believe.
That's an urban legend. The holiday of Halloween is based on both the Celtic festival of the harvest and the Roman festival of the dead (additionally the Roman festival of the goddess of fruits and seeds). The whole costume/candy thing is derived from a middle-age British tradition where the poor would essentially "trick or treat" for coins in return for prayers for the dead (known as "Souling"), and the Scottish/Irish tradition known as Guising which is virtually the same thing.
The fact is, our American adaptation is nothing more than harmless holiday fun. It has nothing to do with "demons and evil things", those are just a part of the tradition of scaring people. The closest holiday to Halloween is the Catholic-Spanish "Dia De Los Muertos", which is just a celebration in honor of the dead.
In other words, you didn't take the time to actually research the holiday or its cultural significance because you're close-minded and stupid. Your dumb-ass assumption comes from the ultra-Christian-conservative view that it's a pagan religious holiday and all pagans should go to hell because they don't believe the same thing you do.
