He "said" that he had been a very devout believer. I've heard others make that claim as well. Some people even come on these Christian forums and make that claim but when I press these people to explain to me how they became a Christian and what it means to be a believer, they could not give me a sufficient answer.
This demonstrates to me that his faith was never firmly rooted and established in Christ from the start or else he would have continued. In John 8:31, Jesus said if you continue in My word, then you are TRULY disciples of Mine..
1 John 2:19 - They
went out from us, but they
were not of us; for
if they had been of us, they
would have continued with us; but they
went out that they might be
made manifest, that
none of them were of us.
The Bible makes it clear that not everyone who sets out to be a disciple of Christ is a genuine believer. In the latter part of John chapter six, after Jesus' hard sayings about partaking of His flesh and blood (vs. 48-58), some of His disciples complained. We are told that Jesus knew that some of them
did not believe. John 6:64 - But there are some of you who
do not believe. For
Jesus knew from the beginning who they were who did not believe, and who would betray Him. In verse 66 it says, "From that time
many of His disciples went back and walked with Him no more." This group had been called 'disciples', but He says they
did not believe, and finally they left. From Jesus' very words, we know that they were
not believers/not saved in the first place.