While I agree that the left hates Christianity, I also remember articles where Halloween was described as irreligious and pagan by writers claiming to speak on behalf of Christianity.
Yes, I’ve heard/read the same as you, however the event is considered as part of Christianity of yore, therefore as much a target for the left as any other aspect of Christianity. If it’s historically related then it’s a target to them.
“Halloween, or Hallowe’en (a contraction of All Hallows’ Evening), also known as Allhalloween, All Hallows’ Eve, or All Saints’ Eve, is a celebration observed in a number of countries on 31 October, the eve of the Western Christian feast of All Hallows’ Day.”
How has it been hijacked to be considered satanic?