What are the similarities and differences between someone who faithfully attends church services and someone who religiously watches new Star Trek episodes?
An interesting question.
There are several Star Treks, from different eras ─
Primitive, which behind Shattner + Nimoy, clunky effects, and all the fist fights and set-your-phasers-to-stun, reflects Roddenberry's humanist outlook: the good guys boldly go, help, show respect, reach out, do the right thing, expand human knowledge, use reason, solve problems.
Generations had a much bigger budget, much better plotting, a captain (Paddy Stewart) who could act, and was Star Trek's high tide, even more visibly and effectively humanist. (Then the duller
Soap, with Janeway, and
Losing Your Grip with Archer, and so on. The
Reboot with J.J. Abrams is a step towards Marveldom, but still with the humanist ideals in there somewhere.)
In short, all Star Treks set out to tell tales with a particular moral PoV which now and then can get a bit close to preachy, but gee it looks good in the Age of Trump.
How does that differ from going to church? Well, no one gets worshiped, is the most striking thing for me ─ simple admiration will do it, and you can be as critical as you like. Oh, and there's no collection, no tithing, no fetes ...