Given the fairly easy time Christianity has had over the centuries (apart from fighting amongst themselves) in portraying its core beliefs as facts, which is due in part to them having the social and political influence to enforce their agenda, I'd say that it is essential in these more enlightened times to counter the myths of Christianity for as long as organised Christianity seeks to promote these in the public arena.
Therefore, it is quite reasonable to point out the fallacious nature of the arguments Christianity makes to justify itself, as is exemplified by the likes of Hope and Alan Burns, and press them regarding what methods they can appropriately use to confirm the supernatural - and it is clear they don't have any and depend instead on a set of logical fallacies.
If they kept it to themselves then fine: but they don't.