Deities in PFS?

So I’m playing a Summoner, but want to take a trait that says I must follow a outside deity. (ie Cthulu, Yog, etc.) the trait (Unspeakable Bond) is PFS legal, but the deities aren’t. Since I’m not required a god for my class can I pick a non PFS god

This is something that can only be answered in the PFS section IMO. Flagging to move it someplace that can answer your question.

This has happened before. The feat Dreamed Secrets used to be legal though the required Deities were/are not. You need to Worship one of those deities for the trait and they are not legal selections so unfortunately this trait might as well not be legal.

There is no legal way to take the trait in PFS since it requires you to worship gods which are not legal in PFS.

Here's a full list of PFS legal deities.

It's been specifically stated multiple times in resource material for PFS that the Outer Gods are not legal for play, so it might be a good idea to flag to the team to mark the Unspeakable Bond trait as not legal for play in the additional resources.