What's the plural form of pseudoreligion? Here's the word you're looking for.
Answer
The noun pseudoreligion can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be pseudoreligion.
However, in more specific contexts, the plural form can also be pseudoreligions e.g. in reference to various types of pseudoreligions
or a collection of pseudoreligions.