If there is one true religion, then the rest are false. Ergo, all other not-religions are heresy.
Any religion that is not your religion is not-religion because it is not your one true religion.
Therefore, the odds are your religion is heresy since it is outnumbered by many others.
The set of all not-religions is the set including all not-your religions and your religion. So Christianity is included in the set not-Buddhism. The negation of your religion is the rest of the Venn diagram.
But how does any one find out which is true?
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