Carnality is the fastest way to arrest spiritual development. So, must times when you see believers stagnant and unproductive in their Christian walk, this could be tracable to carnality.
Faithfully going to church does not automatically make you a mature Christian. As you cannot grow without personally staying connected to Jesus ( John 15:4-5 ).
Times of trials can be a time to grow spiritually if you will really hold unto God ( 1Peter 5:9-10 )
Therefore, ” as newborn babes, desire the sincere milk of the word, that ye may grow thereby” 1Peter 2:2