John 3:36: He who believes in the Son has eternal life; he who does not obey the Son shall not see life, but the wrath of God rests upon him.
Your comment is a perfect example of how those who are outside of the Catholic Church have separated themselves from the full revelation which God has given us.
The RCC has not infallibly interpreted this verse. Your private interpretation is wrong. Jesus says "He who believes in the Son has eternal life"The flip side is those who do not Obey the Gospel, (belief in the Son). Obey can also be translated believe in this verse. It does not matter however,
Joh 1:12 - But as many as received Him, to them He gave the right to become children of God, even to those
who believe in His name
A parralell to John 3:36
Joh 3:18 -
"He who believes in Him is not judged;
he who does not believe has been judged already,
because he has not believed in the name of the only begotten Son of God.
Joh 6:29 Jesus answered and said to them, “This is the work of God, that you believe in Him whom He has sent.”
Joh 8:24 “Therefore I said to you that you will die in your sins; for
unless you believe that I am He, you will die in your sins.”
Joh 11:26 and everyone
who lives and believes in Me will never die. Do you believe this?"
Ga 3:22 But the Scripture has shut up everyone under sin, **so that the promise by faith in Jesus Christ might be given to those who believe. **
1Ti 1:16 Yet for this reason I found mercy, so that in me as the foremost, Jesus Christ might demonstrate His perfect patience as
an example for those who would believe in Him for eternal life.
1Jo 3:23
This is His commandment, that we believe in the name of His Son Jesus Christ, and love one another, just as He commanded us.
1Jo 5:10 The one
who believes in the Son of God has the testimony in himself; the one who does not believe God has made Him a liar, because he has not believed in the testimony that God has given concerning His Son.
1Jo 5:13
These things I have written to you who believe in the name of the Son of God, so that you may know that you have eternal life.
Thats just the tip of the ice berg of verses that mention believing first. Obedience is a Result!