I wasn't raised in any religious tradition (except insofar as you could consider my parents' committed atheism a "religious" position). I don't really believe in god but I don't believe in no-god. it's just never been part of my life. But I am really isolated and missing a sense of community. I also struggle a lot with depression and I've considered "finding religion" but I don't really know where you start with that. forgive me if this is a weird question. just something on my mind right now.
edit: i'm not asking abt any specific religious tradition. I live in a big american city so i'd probably have a variety of options but it seems to me that the most likely places would be churches of any denomination or a mosque.
It is not weird in the slightest, and I think prety much any congregation would be happy to have you there. If you live in a big city you should also be able to find actual events where people who do not follow that religion are specifically invited in order to maintain good relationships and understanding between different faiths. Pretty much any priest/imam/rabbi would be happy to talk to you at any time, so there is no need to stick to those scheduled events, but if you are unconfortable asking for their time you could probably find a scheduled time where you are specifically invited as someone who is not a part of the religion.
I also live in a big city, and while I am comfortable in my atheism I do have a fairly major church close to where I work. I will visit sometimes just to sit on an uncomfortable bench in a large quiet room and marvel at the lack of advertisements. I think it has done wonders for my mental well-being.