That's pretty funny, considering that Halloween is short for All Hallows' Eve, the day before All Saints' Day. No link to Christianity? If it weren't for Christianity, there would be no Halloween at all.
Google it.
The ghosts and goblins? Have you ever looked at the gargoyles on a European cathedral? They're everywhere...designed to show folks what's waiting for them if they don't become Christians.
Oh, yes, Halloween has much to do with Christianity.
Sorry, but the pagan holiday Samhain was around long before the Christians came to be. Do you believe everything you read on Google?