Awful film

well yeah, you are right, "Porcile" is not amongst Pasolini's best works, actually it's one of his weakest films (perhaps only "Teorema" is worst).

Anyway I've enjoyed most of his films, some of them are truly masterpieces: Accatone, Mamma Roma, The Gospel According to St. Matthew, La rabbia, and I can't help it: I liked Salò.

Porcile is one of Pasolini's best

Julian = Jesus

Ida = Mary Magdalene

Julian never had sex, has a desire for fulfillment, a limitless supply of happiness and freedom, an obscure destination, and he is neither obedient nor disobedient to his Father [G-d]. A sorrowful mystery is over him, he remains inalienable, his prestige is intact yet he is fleeing, he bitterly assumed an authority, he feels struck with limitless grace, he is referred to as a guinea pig [G-d's experiment of sending a Man down amongst the people...], he enters a catatonic state [death] and rises out of it [resurrection], and he is mysteriously crucified by Pigs [Jewish rabble...], and because nothing remains of his body to prove he was killed, his existence becomes a mystery.

Julian mentions that his Father is his ambiguous friend and ambiguous enemy, and that his Father's ambiguous conscience merged with Julian's pure existence.

All of this is directly derived from the dialogue, Pasolini gave us a post-WWII Gospel of Jesus.

There is much more to this, a few more tidbits to think about - Julian/Jesus prefers spending his time with Pigs [Jewish people/the Jewish "rabble" that needed sorting out and people in need of spiritual guidance]

For 800+ years, Jewish people were accused of cannibalism and of sacrificing children and drinking their blood, in the film they are accused of killing Jesus [the Pigs kill Julian] yet Jewish people do not eat pork or consume blood and are prohibited from killing (and would therefore not kill and eat a human), and pigs themselves predominantly eat grass, leaves, flowers, fruits, and tree bark...yet ironically have been known to eat their own infant piglets and other pig carcasses (but this is rare, except in factory farms)

Julian feels his Father is hypocritical and unjust yet he feels powerless to counter him

Even though Jesus was resurrected, many non-believers [enemies of G-d] then and now continue to attack and denigrate Jesus, and even though Julian was resurrected, enemies of his Father attacked and denigrated Julian, and even in Julian's second death the denigration will continue because his habits and death were mysterious

Julian's Father was a war profiteer whose son perhaps paid the price for his inhumanity

Many people feel the G-d of the Hebrew Bible was a violent, warring G-d, and Jesus paid the price for that [killed by Jews who followed G-d of Torah] and for humankind's violence in general

In the second tra-la-la sequence (there were two, one in the palace, one outside), Julian admits he has never been kissed (virgin Jesus), and he tells Ida that if she loves him, she is free (salvation is Jesus = freedom). He asks for her pity and she refuses (Jews supposedly did not pity Jesus, demanded his death, the Romans did not pity Jesus, executed him). Ida laments her dignity (Mary Magdalene) and Julian' response is "if you love me, you're free" which parallels salvation.

In the film it is also mentioned that Germans suffered idleness, unemployment, and exile. Jews suffered this as well. Still resolving that. I do not like the meaning I am personally inferring - Germans were to blame for their plight, Jews were to blame for the Holocaust. But I do believe that is what Pasolini meant.

Tra-La-La = Verily, Verily