Jesus tells about four different types of people you will find in every Church. Only one brings forth fruit unto salvation, and all the others endure for awhile, and others hear the Word but satin steals the word. There is one type of person who receives the Word but never produce any fruit unto salvation, yet they never fall away either. The Church today are filled with people like these who think they are saved, but are not.
Mar 4:18 And these are they which are sown among thorns; such as hear the word,
Mar 4:19 And the cares of this world, and the deceitfulness of riches, and the lusts of other things entering in, choke the word, and it becometh unfruitful.