This is the 2536th most frequent Russian word.
религиозных
"Religious."
In this sentence, the word 'религиозных' is used as an adjective in the genitive plural form, modifying 'мероприятий' (events).
Часто он посещает религиозных мероприятий.
He often attends religious events.
Here, 'религиозных' describes 'течений' (movements) and shows its role as an adjective in the genitive plural form.
Она изучает историю религиозных течений.
She studies the history of religious movements.
In this example, 'религиозных' is an adjective modifying 'памятников' (monuments), presenting it as genitive plural.