Greek-derived nouns ending in -on change to -a in the plural form.
Religion is regular. It follows the Greek -a rule.
Use plural verbs: "The religia are ready" (not "is ready").
Yes. The plural religia is standard across all English variants.
The word religion follows the standard English pluralization rule. When forming the plural, religion becomes religia. This follows the Greek -a pattern, which is one of the most common plural rules in English.
Understanding why religion becomes religia helps with spelling and pronunciation. Greek-derived nouns ending in -on change to -a in the plural form.
When using religia in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The religia are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.