I have not seen one post which infers that the woman would have been wrong to NOT teach the lesson at all. She could have done something else. Instead, she forced herself in between children and parents and what they believe.
I don't know whether you mean infers or implies, but in either case, in defense of Theresa Rodriguez Farrisi, a substitute is supposed to teach what's given in the lesson plan. If he doesn't, then the schedule for covering a unit can be thrown off, etc. There's a lot of schedule management in teaching, especially elementary school--to plan things around holidays, fit district requirements and schedule, standardized tests, etc.
Still, as I said earlier, there are other options... One is to ask the principal (tough, as they are very busy in morning), and another is to teach it as a sociology lesson, depending on the teacher's lesson plan goals.
What I think is very wrong is to defend the approach Ms. Farrisi used, rather than to submit an apology if she does, indeed, realize she was wrong.
and
There may be more on this long thread, but these opitions were available and it came from two substitute teachers.