You made some surprising leaps there, but I don't not like them! Basically, yes. Kaneko has always hyper-stylized his demons, and Mara wasn't always as crass as he is now. Despite the shocking design, he was very understated in SMT2, and his role was appropriate to the original myth.
There are phallic and vulvic deities within mythology outside of SMT, so I'd be willing to give Mara a pass, but in every modern entry he's like "MY NAME IS MARA AND I'M HERE TO SAY, I'VE GOT A BIG DICK IN A MAJOR WAY, I SAID A MAAAAAJOR WAY"
Jodorowsky and Giger would've made a good Dune.