Presuppositional apologetics arguments attempts to show the logical inconsistencies in non-Christian world views. Is it not the case that, by beginning with the the presupposition that the Christian world view and the bible are the absolute truth, thereby beginning with the desired conclusion as part of the premise, this form of apologetics commits the fallacy of circular reasoning or begging the question?

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Not necessarily. On the one hand, if a world view disagrees with Christianity, then it's obviously inconsistent with Christianity. However, it need not be internally inconsistent. And if it is internally inconsistent, then this can be shown without assuming Christianity.

A bit more generally, however: a Christian apologist might have more than one logical goal. One goal might be to show that some rival view is incoherent, thereby eliminating it from contention. Another goal might be to point out some not-so-obvious inconsistency between some claim of a rival view and the core doctrines of Christianity. The second sort of enterprise doesn't beg the question either, though the inconsistency by itself wouldn't have to count in favor of Christianity.

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