John 14:15 Please see the comment section for the details.

To determine whether you or someone else is truly saved I’ll say that it is impossible to know that with absolute certainty. Neither one of us can peer into his/her soul to know it.

However, with ourselves the bible tells us to examine ourselves whether we're saved (2 Corinthians 13:5); & with others we can know from scripture the indicators of true believers.

Assuming that you have already embraced the right fundamental doctrines of the faith ask yourselves the following questions:

1. Have I truly accepted God in who He is (Exodus 34:6-7 & Isaiah 55:8-9)?

2. Have I honestly repented & live in repentance (not only stop sinning but resolved to no longer live in sin)(Mark 1:15, 1 John 2:15-16, & 2 Corinthians 7:10)?

3. Have I really trusted Christ alone for my salvation & not by my own goodness (Romans 10:1-4 & 9-10)?

4. Have I truly surrendered to Christ as my Lord, not just savior (Matthew 10:13-15 & 13:18-23)?

5. Did I know the risk but still willing to suffer for Christ's sake which includes the risk or certainty of rejection, persecution, & death (John 15:18-20, 16:2, & Matthew 24:9)?

6. Am I progressing in knowledge, holiness, & righteousness (2 Timothy 2:15, 1 Thessalonians 5:22, & Ephesians 2:10)?

7. Am I loving my brothers & sisters as I do myself (& not hating them - 1 John 2:9)

The essential difference between true & false believers is that true believers genuinely love the Lord & hate their sins. They care more about His glory than their own advancement, popularity, & prosperity.

That kind of love & devotion cannot be faked; true believers are changed believers as when they believe they receive a new nature whereas before were rebellious & cared nothing about Him (2 Corinthians 5:17 & Romans 8:6-7).

Loving Him & keeping His commandments should not be burdensome to you (1 John 5:3).

Now, if this is you, that you’ve answered yes to all of the questions you can be sure that you are saved.

SCRIPTURES ONLINE:
https://www.biblegateway.com/passage/?search=2+Corinthians+13%3A5%2C+Exodus+34%3A6-7%2C+Isaiah+55%3A8-9%2C+Mark+1%3A15%2C+1+John+2%3A15-16%2C+2+Corinthians+7%3A10%2C+Romans+10%3A1-4%2C+9-10%2C+Matthew+10%3A13-15%2C+13%3A18-23%2C+John+15%3A18-20%2C+16%3A2%2C+Matthew+24%3A9%2C+2+Timothy+2%3A15%2C+1+Thessalonians+5%3A22%2C+Ephesians+2%3A10%2C+1+John+2%3A9%2C+2+Corinthians+5%3A17%2C+Romans+8%3A6-7%2C+%26+1+John+5%3A3&version=ESV

They may say yes but it isn’t true

If you’ve experienced true Christianity, then you would never even want to walk away from it

Not setting it up I’m just bluntly saying it.

And I’m saying they weren’t a Christian to begin with

Because I’ve read the bible

Where

Why would you ask if you've read it?

I’m asking for him to show me

Show me any mistake in the Bible

Can you prove all of these mistakes?

I didn’t interpret it I read it

I let the people who actually have been studying the Bible for years and take old texts from the first century by people with sound doctrine and study those because as a person who hasn’t studied scripture well enough, my interpretation is liable to be very wrong

Your "interpretation" was given to you by someone with an agenda filtered through Roman Paganism.

I don’t trust the Roman church

The ones I study all agreed with each other