The word creerán is the future form of creer in the third person plural.
See the full creer conjugation

creer

Y un gran número de personas creerán que nunca sucedió.
And a large number of people will believe it never happened.
Pero cuando te pongas esta camisa y hables, lo creerán.
But when you put on this shirt and talk, they will.
Y no lo creerán, ella estaba cubierta de sangre también.
And don't you know it, she was covered in blood too.
No creerán lo que vi en el camión esta mañana.
You won't believe what I saw on the bus this morning.
Si llamamos a la agencia pidiendo ayuda, nunca lo creerán.
If we call the agency for help, they'll never believe this.
No creerán que es Batman si le doy un arañazo.
They won't think it's Batman if I give him a scratch.
Puedo mentir mejor que tú, y me creerán.
I can lie better than you, and they believe me.
Muchos verán y todavía no creerán, porque sus corazones están endurecidos.
Many will see and still not believe, for their hearts are hardened.
Ustedes no lo creerán, pero estaba empapado como una esponja.
You wouldn't believe it, but it was soaked like a sponge
¿Piensas que tus amigos creerán que fuiste capaz de escapar?
You think your friends will believe you were able to escape?
Esperen, ¿no creerán que tuve algo que ver con eso?
Wait, you don't think I had anything to do with it?
Tú crees lo que estás diciendo y ellos lo creerán también.
You believe what you're saying and they'll believe it, too.
No creerán que no estabas en mi cuarto.
They will never believe that you weren't in my room.
No creerán que tengo algo que ver con esto.
You don't think I had something to do with this.
Y todos en este tribunal creerán que tienes algo que ocultar.
And everyone in this courtroom will think you have something to hide.
No me creerán si les digo lo que viene.
They won't believe me if I tell them what's coming.
¿No creerán que tengo algo que ver con esto?
You don't think I had anything to do with this?
Estoy seguro que le creerán a una chica anticuada como tú.
I'm sure they're gonna believe an old-fashioned girl like you.
¿No creerán que tuve algo que ver con esto?
You don't think I had anything to do with it?
Las personas difícilmente creerán que ustedes están juntos en absoluto.
People will have difficulty believing that you are together at all.
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