Have an open mind to things, but don't have such an open mind that your brain falls out.
If the scientific community present peer reviewed research on a theory and are willing to change their mind should other evidence surface conflicting with their theory, its understandable and reasonable to believe them, that is not pure faith.
If a priest presents a book with nonsense written in it, containing acts of impossible feats with no evidence and plenty of logical errors, and wants people to believe its contents, no matter how daft or evil in it, it is completely reasonable to question it and criticise it, and takes a completely unreasonable amount of faith to believe said priest.
If the scientific community present peer reviewed research on a theory and are willing to change their mind should other evidence surface conflicting with their theory, its understandable and reasonable to believe them, that is not pure faith.
If a priest presents a book with nonsense written in it, containing acts of impossible feats with no evidence and plenty of logical errors, and wants people to believe its contents, no matter how daft or evil in it, it is completely reasonable to question it and criticise it, and takes a completely unreasonable amount of faith to believe said priest.