Secular clubs are one thing, but their are secular groups that have a specific goal in mind. That usually makes people like minded enough.
I always felt more accepted in groups outside the organization, but that is because my entire adult life while in the organization I was secretly being shunned and had no clue.
Right after high school I joined a local chapter of an international Star Trek club. We did a lot of charitable work. We volunteered to work at Star Trek conventions. We had parties and BBQs. It was great.
I'm highly active in local and statewide groups that advocate for my chosen profession. This involves charitable work and other enjoyable activities.