'Believe' is used 49 times in the Gospel of John, 4 times in 1 John, and not at all in 2 or 3 John.
'This does not include the derivatives of the word believe.
Using my Logos software I found that the word pistis which is translated believe as well as its different parts of speech is used at least 87 times in the Book of John
52 times
The word "believe" is found 75 times in the NIV Bible's Gospel of John.
75
54 times in the New International Version
50 times.
52 times
The root word for believe is the Latin credere or creditus and these words are not in the Bible. The English equivalent "believe" is used 53 times in John while the other English equivalent "trust' is used just once in John 5:45.
67
The word "believe" is found 75 times in the NIV Bible's Gospel of John.
11
75
54 times in the New International Version
50 times.
around 4 times i believe
25
5
5 times kjv source:e-sword