Likewise if we no longer believe, we are no longer saved.
This statement is a mere opinion without any Scriptural support.
12 Those by the wayside are the ones who hear; then the devil comes and takes away the word out of their hearts, lest they should believe and be saved.
Believe = Saved
13 But the ones on the rock are those who, when they hear, receive the word with joy; and these have no root, who believe for a while and in time of temptation fall away. Luke 8:12-13
Believe for a while = Saved for a while
These verses aren't support for your opinion. Where does either verse say that if believing ceases, salvation ceases?
Temporary believing gets you temporary salvation.
If this is biblical, where is it stated?
Those who endure to the end will be saved. Matthew 24:13
Check context. Refers ONLY to the Tribulation.
This is the simple foundational truth, Jesus taught to His disciples, including Paul.
Actually, Jesus and Paul both taught eternal security.
Jesus said it this way:
John 5:24 - Truly, truly, I say to you, whoever hears my word and
believes him who sent me HAS eternal life. He does not come into judgment, but has passed from death to life. This establishes the fact that WHEN one believes, they HAVE eternal life. Not just a promise for it some time later.
Then Jesus said this:
Johbn 10:28 -
I give them eternal life, and they will never perish, and no one will snatch them out of my hand.
So, from the moment one believes, they HAVE eternal life, per John 5:24. And Jesus promises that those to whom He has given eternal life WILL NEVER PERISH, from Jn 10:28.
Jesus also said this:
John 4:14 - but whoever drinks (aorist) of the water that I will give him
will never be thirsty forever. The water that I will give him will become in him a spring of water welling up to eternallife.” This establishes the FACT that from a point in time action of drinking, which is a metaphor for believing in Christ, one WILL NEVER THIRST. Nothing about having to continue to believe to continue to be saved.
Jesus also said this:
John 10:9 - I am the door. If anyone
enters (aorist) by me, he will be saved and will go in and out and find pasture.
Again, Jesus establishes the FACT that from a point in time entering, a metaphor for believing in Him, one will be saved. Nothing about having to continue to believe to continue to be saved.
Then, Paul answered the jailer's question of what he MUST DO to be saved:
Acts 16:31 - And they said, “Believe (aorist) in the Lord Jesus, and you will be saved, you and your household.”
Again, to be saved, one must believe in a point in time. Not continuously believe in order to be continuously saved.
Be faithful until death, and I will give you the crown of life. Revelation 2:10
JLB
The crown of life is a reward for faithful service. Why would one think it refers to salvation itself? I guess only those who think that salvation is earned by faithfulness.
But we are not saved by being faithful. We are saved by grace through faith.