You arrive at the Main Praying Hall, but you are disguised as a nun, and you can walk freely.

You notice a huge group of cultists praying in front of a stone altar, all of them are male. The space is filled with the low murmur of their prayers.
The stone altar is carved with unrecognizable symbols that pulse with a red energy. Tendrils of eldritch energy and the same miasma that you noticed in the sky and everywhere are swirling around it.

There are thousands ofcultists, but there you can easily manage to blend into the group without being discovered. Also, you can manage to approach the altar from one of the sides and inspect it.

You must decide it now before is too late join them and pray, or walk closer to the altar.

What do you do?