Two different words are used for believe in John 3v36. Using the KJV and Strongs concordance below:
John 3v36 KJV 36 He that
believeth on the Son hath everlasting life: and he that
believeth not the Son shall not see life; but the wrath of God abideth on him.
Strongs: 3:36 He that
believeth 4100 5723 on
1519 the Son
5207 hath
2192 5719 everlasting
166 life
2222: and
1161 he that
believeth not 544 5723 the Son
5207 shall
3700 0 not
3756 see
3700 5695 life
2222; but
235 the wrath
3709 of God
2316 abideth
3306 5719 on
1909 him
846.
- The first believeth is
Word:
pisteuw
Pronounce:
pist-yoo'-o
Strongs Number:
G4100
Orig: from 4102; to have faith (in, upon, or with respect to, a person or thing), i.e. credit; by implication, to entrust (especially one's spiritual well-being to Christ):--believe(-r), commit (to trust), put in trust with.
G4102
Use: TDNT-6:174,849 Verb
Heb Strong:
H6004 H8085
1) to have faith in, to be persuaded of, to credit, place confidence in
1a) of the thing believed
1a1) to credit, have confidence
1b) in a moral or religious reference
2) by implication, to commit or entrust, i.e. to entrust your spiritual well-being to Christ
2a) to make a commitment (to trust)
2b) to put in trust with or place confidence in
- The second believeth is
Word:
apeiqew
Pronounce:
ap-i-theh'-o
Strongs Number:
G544
Orig: from 545; to disbelieve (wilfully and perversely):--not believe,
disobedient, obey not, unbelieving.
G545
Use: TDNT-6:10,818 Verb
Heb Strong:
H2308 H3808 H3808 H3985 H3988 H4603 H4775 H4784 H4843 H5637 H8280
1) not to allow one's self to be persuaded
1a) to refuse or withhold belief
1b) to refuse belief and obedience
2) not to comply with
There is a glaringly obvious reason why a different word is used. The first one is to put your faith in. The second one is to heed and obey what He says.