Abstract concepts, even ones considered materially 'incomprehensible' like love, or ones considered materially inconsistent or impossible like taking the square root of a circle, are names - very long, patterned symbol sequences condensed from salient features of the far more complex structures they reflect, objects that would be otherwise inconvenient to discuss or contemplate on human time scales and within human constraints. Abstract information, any information, is the result of an energetic compromise necessary for our relatively insubstantial chunk of brain tissue to be able to play-manipulate objects far greater in scale, scope and remoteness then it physically could interact with. But it is still physically manipulating them, or rather the lightest of lightweight representations of them, at the mechnical, physical matrix of neurological energy exchange processes.
I've heard both theists and atheists express similar feelings about the implications of physicalism (I think that's the term, but I'm not a philosopher), but I've never understood why in anything other than an abstract sense. I can understand why someone would be concerned by things ending so finally, but it's not like you'll be around afterward to feel bad about it. If anything I find it very comforting.
I can understand wanting to be around for other people, but afaik there are plenty of religions where people aren't able to intervene after death and I don't hear the same concerns about those.
Supposedly secular western people invoke the same basic concept. For example, they talk about things like "human dignity": https://www.humanrightscareers.com/issues/definitions-what-i... ("At its most basic, the concept of human dignity is the belief that all people hold a special value that’s tied solely to their humanity."). That papers over God as the source of "human dignity" but it's expressing the same basic belief. That assertion makes no logical sense if you abandon the underlying metaphysical notion and posit that humans are actually just meat.