Umm, I think, the question of the OP is simple that not all who believe will be saved as in the case of the Devil.
The scripture in Acts 16:31 says he is to believe in the Lord Jesus Christ. Did The jailer believe in Christ? Yes, he did and he was saved. Because such "belief in Christ" is needed in order to be saved and as not "Believe" only as the title of the OP says.
Thanks for your reply, but if you didn't know that the OP was indeed referring to Christ, then you'd be the first. Who else would be in view when we're talking about the scriptures? But, just to clarify, yes, I did mean "Not all who believe
in Christ would be saved". Now, why would I say something like that? Precisely for the reason of your post. Because there are many who take the scriptures at face value (based on no hermeneutic found in the scriptures) rather than looking at the scriptures as a whole for true doctrine. Rather than letting the Bible as a whole determine what God means by "believe" and not what we determine it to mean.
Acts 16:30–31 (KJV 1900)
And brought them out, and said, Sirs, what must I do to be saved? 31 And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house.
Now, if we examine the passage closely, the jailer obviously wanted to know how to become saved. There is nothing uncommon here so far, as many have wondered the same thing. And then he is told to "believe in Jesus" and he would be saved. "Presto", some would say. How clear is that? The problem is that we cannot let ourselves be led to a conclusion based on a few passages that seem to say the same thing. This is where the hermeneutic problem comes in. Everything in the Bible has to agree with our conclusion before we can be sure that we understand what seems to be an apparently plain statement. Also, if we look at the Greek word (
poieō ) that God used here, which is translated as "
do" (what must I
do...), we'll notice that it identifies with
DO-ing work. It's Strong's #G4160 for anyone who wants to look it up and see). And this agrees with the fact that "believing" is indeed a work, as it is a commandment that requires obedience, just like don't steal, don't lie, etc. which don't save anyone, but rather these works are evidence of salvation, not prerequisites. Else these would be too.
Matthew 19:17–19 (KJV 1900)
And he said unto him, Why callest thou me good? there is none good but one, that is, God: but if thou wilt enter into life, keep the commandments. 18 He saith unto him, Which? Jesus said, Thou shalt do no murder, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness, 19 Honour thy father and thy mother: and, Thou shalt love thy neighbour as thyself.
But, back to the jailer. There are some who approach a passage like Acts 12:31 by asking, "how did the jailer understand what was said to him? But again, this is the Word of God, and if we think truth is found by placing ourselves in their shoes, then we have to be able to substantiate it with the scriptures, and the scriptures don't teach us to do that, our own fallible logic does. God spoke many things in the scriptures to the nation of Israel, and even though they took what God said at face value, those words were actually written to have another truth altogether, a more valuable truth, a spiritual truth which the nation of Israel, at the time, had no idea of.
1 Corinthians 9:8–11 (KJV 1900)
Say I these things as a man? or saith not the law the same also? 9 For it is written in the law of Moses, Thou shalt not muzzle the mouth of the ox that treadeth out the corn. Doth God take care for oxen? 10 Or saith he it altogether for our sakes? For our sakes, no doubt, this is written: that he that ploweth should plow in hope; and that he that thresheth in hope should be partaker of his hope. 11 If we have sown unto you spiritual things, is it a great thing if we shall reap your carnal things?
So, here we are taught the opposite of what the literal historical grammatical method of interpretation teaches. That we are not to put ourselves in the shoes of the ones who received the word to see how they understood it. It's the same here with what was said to the jailer and what he did, which was "believe". There is much information that needs to be pieced together to understand how he came to believe in the first place, or where the desire to truly become saved came from. It wasn't from seeing the miracles because the Bible is full of miracles done by God, much greater than shaking a prison, opening doors and loosing chains, and yet the ones who saw the miracles still did not believe. These are questions that only the Bible can answer and which will give us a much broader perspective of the true process of salvation, rather than interpreting everything based on one apparently plain passage, as you have done with John 8.
Because the OP would like to discredit what the plain scripture says, then we will consider the other examples and see them in the proper context.
In John 8, we have different audiences when Christ taught them in the temple as all people gathered.
1) The believing Jews
2) The unbelieving Jews.
Simply, not all of them that heard Christ believed.
Since I already covered the doctrine of believing in what the "plain" scriptures say, (which, if you could provide for me any scriptures that teach the widely accepted "literal historical grammatical method of interpretation", it would be a big help in knowing where your authority comes from, insofar as interpreting the scriptures are concerned. But, let's move on to John 8.
Here, you go into the context already assuming there must be 2 different audiences (believing and unbelieving Jews). You had to approach it this way because this is the only way your plain approach to understanding Acts 16:31 would make any sense. But let's not do that. Instead, let's approach the scriptures by letting the scriptures tell us who Jesus is addressing.
John 8:30–32 (KJV 1900)
30 As he spake these words, many believed on him. (they believed on Jesus Christ, just as it was plainly told to the Philippian jailer to do. Does this mean they were saved? Let's see.).
31 Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed; 32 And ye shall know the truth, and the truth shall make you free.
So, why did Jesus place a stipulation here to those Jews which "believed" on him? If you continue in my word....ye
shall know the truth and the truth
shall make you free". But I thought they were instantly saved the moment they believed? Doesn't that instantly make them free? Why say to those Jews which believed on him "IF" ye continue in my word? This is conditional, but true salvation is unconditional. So, in order for these Jews which believed on Jesus
to be made free they have to continue in his word? Of course, this is a huge red flag that we need to pay closer attention here rather than dismissing them as instantly saved because they believed.
Now, the dialogue continues specifically between Jesus and those Jews which believed on him (because we have no evidence that he is speaking to anyone else). We know this because
they responded to his previous words about being made free, which was spiritual, but they took it at face value.
John 8:33 (KJV 1900)
They answered him.....
John 8:34 (KJV 1900)
Jesus answered them...
The Christ repeats himself to them about being made free, and then comes the condemnation once again.
John 8:36–37 & 44 (KJV 1900)
If the Son therefore shall make you free, ye shall be free indeed. 37 I know that ye are Abraham’s seed; but ye seek to kill me, because my word hath no place in you. 44 Ye are of your father the devil....
Nowhere here does the text suggest that Jesus was speaking to 2 groups of people from verse 30 and on. Everything that was said was between Jesus and those Jews which believed on him. Which obviously did nothing for their spiritual condition. And that was the point of God recording for us the whole dialogue this way. To be able to see that there is a problem with just saying that believing in Jesus will save you, no questions asked. No, this shows us that there is far more to this doctrine that leaning on the plain and simple statements we pick.