1). It's not impossible, but it is improbable. Very many Christian doctrines focus on non-science and very platitudinous ways of "helping" yourself, most of which are just feel good bullshit (which, maybe, is the point of self-help books) but I feel like they should at least appeal to people in a secular way so as not to marginalize consumers. I don't like professed Christian
anything, just as I don't like professed Atheist
anything. It's equal on both sides. I don't really understand where your anger/ire is coming from.
2). From anti-Semitism, things such as National Socialism or Fascism (or whatever you equate with Hitler I suppose) seem to logically or illogically follow. Thinking a Christian most probably cannot write a self help book worth a goddamn if it professes Christian belief systems or professes Christian dogma in an overt, irritating way is not 1-to-1 equivalent to "anti-Semitism", and it's mildly amusing that you'd even post this.