It's not a church-style group, but one of the things that most sold me on Big Brothers Big Sisters was that they are completely secular. There's lots of community and support and volunteering is a great way to help feel good about yourself. And they don't push religion (or frankly not-religion) at all.
My little brother graduated high school this spring after 8 years we've known each other. I strongly recommend BBBS.

Personally I don’t care for the exclusive nature and fake brotherhood of a club. Like religion or a frat it seems to suck in people who need an extra level of structure or can’t connect with people naturally. I’ve been recruited by the Elks several times but they seem to completely underestimate how offesive I find the requirement of belief in a higher power plus the culty stuff and flag worship is waaaay too weird for me. Of course, the lodges have cheaper drinks and steak night so they can’t be all bad. I know an athiest or two who sold out and flat out lied about their beliefs just for that.

If you have a local chapter of the Freedom from Religion Foundation, that would be an ideal place for a guy like you to start.

If you just want to be part of something You can always be part of the Flying Spaghetti Monster organization! They seems to be fun!

I believe in a higher power but I have no idea what power that may be. To pray to or worship this unknown power is very much ridiculous. I would not belong to anything that wanted you to bow your head, close your eyes, and then start talking to yourself. I would not want to belong to anything that dwelled upon a higher power. If you can get away from all this by all means join whatever suits you and don't worry about it.
My take here is that mankind only thinks they are the highest power. Without evidence we do not even know this for sure. Disease germs have been trying to take over for centuries. Cats might be plotting a rebellion.

I joined the Masonic lodge earlier in my life when I was still a believer and was trying, foolishly to get closer to my father. It is deeply religious and honestly every person that I know to be in it is a bit whack-a-drool. Most that I knew openly expressed that they truly believed blacks were not human but intelligent monkeys and I am sure worship Trump.

That is my experience anyway. The history was a bit interesting, how they formed and had to work in secret in Egyptian society.

In the end we are all just looking for someone to talk to.

Maybe the Crips?

They have atheist meet-up groups in some cities, go to meet-up.com to search

What are you interested in?
Check online or on lists posted on your local library bulletin board for community groups that meet for different activities..hiking, cleaning up parks, lakes, and federal nature preserves, playing acoustical instruments, bird watching, canoeing, reading groups, etc.

Go to meet ups with activities that match your interests.

Moose and Elk do not have any religious requirements. I am not a joiner and have no need for that kind of camaraderie, but I don't see anything wrong with it, either. Here's an article from the NYT you might find interesting.

[nytimes.com]

I have not studied in this area.....i have roots here but never went to job's daughters or eastern star. I think possibly it is empowering and honour space at the same time community and volunteerism.

I joined the Masonic lodge earlier in my life when I was still a believer and was trying, foolishly to get closer to my father. It is deeply religious and honestly every person that I know to be in it is a bit whack-a-drool. Most that I knew openly expressed that they truly believed blacks were not human but intelligent monkeys and I am sure worship Trump.

That is my experience anyway. The history was a bit interesting, how they formed and had to work in secret in Egyptian society.

I am looking for community and fellowship. That is the one thing I miss from religion. I have heard of Sunday Assembly and have looked into that, but there are no groups near me.

How about these folks: [americanhumanist.org]

I do a lot of volunteering and meet people that way. Fortunately I live in a large city with lots of humanists groups and for me a Canadian Club.

I think that if you take the supernatural nonsense out of “higher power” you are just talking about taking part in a cause that is higher/broader than ones own self interest.

I'm thinking of looking into a Rotary Club too. Not sure what other options are there.

Join Mensa