Credo translates to "creed," meaning a system of religious or ethical beliefs that guide a person's life. It's a profound and uncommon word to find in a pop song, which makes it very memorable.
In "Dejaría Todo," Chayanne sings, "Dejaría... mi credo, mi pasado, mi religión" (I would leave... my creed, my past, my religion). By offering to abandon his credo, he is expressing the ultimate sacrifice, showing he's willing to give up the very core of his identity for love. This dramatic declaration perfectly captures the song's passionate and desperate tone.
This is one of Chayanne's most dramatic power ballads, and it's all about total desperation. The singer is begging his partner not to leave, and he's willing to give up literally everything to make them stay. He starts by saying he's tried almost everything to convince them while his world falls apart, confessing, "Me vuelvo a preguntar quizás si sobreviviré" (I ask myself again if maybe I'll survive).
He really goes for it in the chorus, promising, "Lo dejaría todo porque te quedaras" (I would leave everything for you to stay). And he means everything: his beliefs, his past, his religion, his name, his strength, and even "Hasta mi propia vida" (Even my own life). It's a huge, over-the-top declaration from someone who feels completely broken by the breakup, saying his body, mind, and soul are disconnected. He knows it's too late and that excuses won't work, but he lays out his total devotion one last time.