John Dagg on Church Membership
"The churches are not infallible judges, being unable to search the heart but they owe it to the candidate [for membership] himself, to exercise the best judgment of which they are capable. To receive any one on a mere profession of words, without any effort to ascertain whether he understands and feels what he professes, is unfaithfulness to his interests, and the interests of religion."

As an orthodox christian, I agree that catechism is a great idea. Unfortunately, I can't find a Biblical example of it in relation to baptism.

God bless,