Depart from me, I never knew you...

[JohnD]

The Bible. That's how you know.

The Holy Spirit alone is the appropriate interpreter of scripture (2 Peter 1:20-21).

Even he (the Holy Spirit) is to be tested (1 John 4:1) not because of any inferiority in him but in us and our ability to correctly distinguish truth from untruth.

As we are to test or prove all things (1 Thessalonians 5:21).

How? Again, the Bible... Acts 17:11 / 2 Timothy 3:16-17

For there are false gospels, false spirits, and false Jesus's being preached all over the world and since the time he was here (2 Corinthians 11:3-4, Galatians 1:8-9)

The Lord Jesus himself warned about this (Matthew 24:24 and Mark 13:22).

It behooves us to track this down for ourselves and not take other people's word for it. 

Eternity is a long time to find you climbed the wrong spiritual ladder.

[JohnD]

Any old Jesus cannot save. It must be the genuine Jesus.

 

[JohnD]

I am not saying you have to be expert on Jesus before you believe. I am saying you validate verify affirm you believe in the genuine Jesus once you get the unction from what may actually be the Holy Spirit.