A fun book.. a funny book, for many reasons. Yes- Marx was essentially a Satanist. Those early poems and such make no doubt about that, and we were fully aware of that before reading this. Some of the additional context, such as from the correspondence between Marx and Engles, and their relation to Moses Hess, was new to us, and certainly useful.
The funny thing is though, that the poor Christian writing this doesn't realize how far under the spell of the same blood demon he is himself. The "father" deity of the Catholic and Protestant Christians (Orthobros might be on to something else, we don't know enough about them to say precisely), is the same deity as the God of the Jews- only "mask on", rather than with the "real" Marx, when it goes "mask off". Of course, in the exoteric communism of Das Kapital, the blood demon goes "mask on", as it does in most of western (pistis>gnosis) Christianity, and this is why "communism" in theory looks and sounds a lot like Christianity: all are equal, love everyone and hold property in common, rich people bad/poor people good blahblah. It's all a crock of shite to cover a ressentiment fueled "rage politics" in the selfrighteous moral superiority state enforced altruism that ~just so happens to massively benefit centralized authority. Communism is simply the next logical step in the Christian logos, with paternal deity on its deathbed as the technical enfolding of industrial "progress" decimates the Occident.
There is the Promethean angle to this mode of thought that we certainly ascribe to, and to what extent Marx personally was motivated by Promethean aspirations, we cannot deign to judge- though certainly Wurmbrand does: he paints us a Marx-as-Satanist that is certainly true to some extent, but that also ends up seemingly in some form of character, as Christians so frequently frame their opposition: degenerate for degeneracy's sake; Satan as "the joker", who wantonly destroys whatever they can, psychotically out of spite, and against their own interest. There are some who are like this, to be sure- but they are the Satanic ~poseurs: the mere antitraditionalists, rather than the authentic counter traditionalists, who only react and so flail, rather than actively construct something of true alternative value. We could be wrong, but we suspect that Marx was something of the latter, rather than the former, and the limited characature offered here isn't able to confront that more pressing probability.