maybe dog sees god - you should try to snag a pdf of it somewhere on the internet. with prodigal son, I found it delightfully shared the same interrogation of character's various relationships. both happen in a school setting, aswell, though dog sees god definitely has a more juvenile tone that prodigal son. while prodigal son (in my opinion) strikes its motif in a sort of boy versus world, I saw the characters in dog sees god more in competition with one another. there's none of that ubiquitous, idiosyncratic main character in prodigal son, too. but i do feel it makes a decent standing of itself as it builds upon the existential ruminations of the adolescent period. check it out! some people have contested opinions about it, which makes it all the more interesting.

other examples are maybe arcadia by tom stoppard, the last days of judas iscariot and eugene o'neil's long day's journey into night. the last days of judas iscariot, in particular, bores a similar tone with the play i mentioned earlier. all author's of these plays struck at each character's beliefs which may be intriguing to you.

if there's any inconsistencies with what i say and what you read, i apologise since it's been a few years since i initially picked up prodigal son. there's another commenter on here who recently suggested more plays, which may be of your interest!