Does anyone know what/who the patron god of humanity is? Dwarves have Moradin, Elves have Corellon, Gnomes have Garl Glittergold, Halfling have Yondalla, even the Drow are stuck with Lolth. Does any god have a 'claim' on humans or are they up for grabs for anyone?
Unless this was specifically changed in a 5e book, no, there is no one god who is the patron of all humans. Tempus may come the closest as a "patron" of all (human) barbarian tribes.