Everyone has their priorities, but if deen (even if youre not super practicing, and just wanting to improve) isnt your priority, then I suppose it would mean very little to you.
Also yes it is true girls can be non-hijabis and not be crazy, tbh even pray, at my workplace theres one asian girl whos always in the prayer room, and the other hijabi sisters are never there, but that is a rare case. You cant read into peoples hearts so you gather what information you can and ask the local community/masjid/families/associates then its easy to filter those that are religious and have been involved and known within the community for a set period (no ones perfect, im not saying they have to be known there since 14 years old lol how you measure that is relative and up to you)
And youre supposed to judge by the apparent eg: If a guy prays, goes to the masjid, somewhat involved in the masjid community etc, youll judge that he is a fairly religious guy and similarly the case for a girl, if she covers islamically, and meets the similar criterias, youll judge that she is religious also ([In both cases youll find out more)]
So look into whats important for you, but physical looks never last, deen and akhlaaq last, actually brings happiness, barakah from Allah and value to your life, and will be vital for your childrens upbringing and Islamic education and is the strongest foundation you could build for family.
I would strongly advise this for both my sisters and brothers!! Wa billahi tawfeeq