The spirit of the words is somewhat different ... here is another similar quotation - "Wherefore if thy hand or thy foot offend thee, cut them off, and cast them from thee: it is better for thee to enter into life halt or maimed, rather than having two hands or two feet to be cast into everlasting fire. And if thine eye offend thee, pluck it out, and cast it from thee: it is better for thee to enter into life with one eye, rather than having two eyes to be cast into hell fire."Arjun wrote: Even if one goes along with your version of the meaning, that does not make exclusivism any less dangerous to society. Christianity has always been big on 'persecution' as a motivating factor for its proseletyzers...and as per your interpretation - it is explicitly justifying the breakup and creation of disharmony within families and within societies as an acceptable practice. Polytheistic religions on the other hand take the opposite tack of not wanting to create disharmony within existing believers of an alternate God - by accepting their Gods as part of the pantheon.
Harbansji is possibly pointing to the fact that exclusivism combined with aggressive expansionism would necessarily lead to conflict. The conflict might initially start small (within families) - but as more and more families in a region suffer the consequence, is bound to lead to larger scale societal repurcussions that are likely to manifest in warfare / rioting / civil war.
Now, this is not about literally maiming yourself. The correct interpretation is that one must be willing to ruthlessly sever every attachment to family, bodily comfort and material wealth, if one wants to free oneself from the "everlasting fire" of endless, unfulfilled desires. In Sanatan Dharma too, similar sentiments are expressed as regards non-attachment.
Ramakrishna Paramhansa had said iirc, that you will find enlightenment if your desire for it is more than a drowning man's gasping for air.
Now it's true that the Catholic and other Churches are primarily political organizations, for the purpose of manipulating people as per the agenda of foreign elites. But we can keep that separate from the original intent of Jesus.