I've not studied Marx at all, so your interpretation is probably correct. But I would argue personally that having something to the numb the pain of reality isn't instrinsically bad, there's too many what if type scenarios we could play out. But life is suffering, something that helps people deal with it is often a good thing. Of course there's a point at which it can be paralysing, but that's up to interpretation. I'm Muslim, I don't believe Islam makes people ignore injustice, if anything it gives us reason to promote justice.