I did not vote either way, but it seems to me that the question was asked in a somewhat subjective manner. As it currently stands, it simply asks for suggestions for one thing the person can do. There's not really an objective way to answer that. There can be as many answers as there are things to do in Judaism. Any answerer can just suggest his/her own favorite practice, or something he/she feels will be beneficial to an irreligious Jew.
Basically, there are no criteria by which to construct an answer. And there are no criteria by which to judge whether an answer is good/bad, useful/not useful, helpful/not helpful. To quote from the text of the close reason:
answers to this question will tend to be almost entirely based on
opinions, rather than facts, references, or specific expertise
As it stands now, that's what the answers look like. With the exception of perhaps one of them, they all seem to just be the opinions of those who posted them. While opinionated suggestions might still be helpful to the person asking the question in this particular case, it still doesn't fit Stack Exchange guidelines. A question that has no way to determine a right answer (or right answers) is essentially a discussion, something that this platform is not designed for.
I think the question could easily be salvaged if more information is added that would make it possible to give objective evaluations. For instance, more information about a specific type of practice that the person is looking for can make it possible for people to give answers that fulfill specific criteria, and provide support for how the answers fulfill the criteria, and allow others to be able to judge whether and to what extent the answers have fulfilled the criteria.
Alternatively, the question can be rephrased to ask if there are existing sources within Judaism that address what a person in such a situation should do. So, for instance, something like:
Does Judaism prescribe a hierarchy of practices for someone who will
only be minimally involved?
This can be answered objectively (either "yes" or "no") and the relevant sources can be cited.
Note that there is nothing wrong with the topic per se. Indeed, if someone is simply seeking suggestions and opinions they will be welcomed with open arms in the Mi Yodeya chatroom, which is more suitable for a discussion of this sort.
In any case, it should be made clear to the questioner that whether the question remains open or closed, it is not anything personal. It's certainly not because we don't like him/her, or we're not welcoming to new users, or we're not tolerant of questions from irreligious Jews. We are only trying to determine whether this particular question, as currently phrased, fits the guidelines for this site. This of course can, and will, be debated by the community until we reach a conclusion, but it is not really something that we can simply ignore.