[Gastonleruanich]

Like others, I'm a bit confused by "by belonging to it you can touch the infinite".

As for "you can have joy without concrete religious obligations", that's certainly true but I don't think it has quite the consequences your friends/family think it does. To make something more substantial you need to add in another premise, probably something along the lines of "One ought/ought not to have concrete religious obligations", which will itself require a long, boring, drawn-out argument which is inevitably going to be inconclusive whichever end you attack it from. Better, perhaps, is to consider the famous injunction to "be lamps unto yourselves".