In some parts of the world the subjunctive is more popular than in others In any case, here you are talking about a fact; in 2, people are allowed to call your religious beliefs mathematics. The subjunctive here would sound hyper-correct to me - a bit like knocking at a door and calling 'It is I'. Nobody could fault its grammar; few would say it.
You can always avoid the problem by nominalizing/creating a noun phrase: e.g. 'I deplore the way you have of always answering a question with a question'
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