Perhaps naive, impressionable.
unbreakable
faith
The word you want may be 'legible' - something that can be deciphered with ease
The word 'believe' is a verb (believe, believes, believing, believed) meaning to think that something is true, to have an opinion about what is true.A verb is a word for being or doing.A noun is a word for a person, a place, or a thing.An adjective is a word that describes a noun.
Believe: verb accept (something) as true; feel sure of the truth
skeptic
The definition of the word gullible is someone who is naive or easily persuaded to believe or do something. It can also mean they are innocent and a follower.
A person easily convinced to believe something, not a bad word but you could hurt someone's feelings or cause embarrassment if applying it incorrectly
Skeptical .
Gullible: Easily persuaded to believe something
The word "accessible" refers to something that is easily reached, entered, or used, especially for people with disabilities. It can also describe something that is easily understood or available to a wide range of people.
KNACK
It means that something may break easily.
Unscratchable? I am not sure if that is the kind of word that you are looking for...
unbreakable
faith
There is no such word as beleive. However "Believe" means to think that something is true or correct