Actually, you have to keep the teachings of Jesus and his response will corroborate their reality.
Jesus followers have been learning to do this for millennia and it's worked quite famously.
Joh 14:23 WEB Jesus answered him, “If a man loves me, he will keep my word. My Father will love him, and we will come to him and make our home with him.
so, do what Jesus said and then they will come and make their home with you.
Having been living with my wife for the past 32+ years has made it utterly impossible to mistake her reality.
In like manner, living with Jesus and God in my life for the past 45+ years has made it utterly impossible to mistake their reality.
Let's go to the concept of God.
Do you have the generic concept of God?
Here it is:
"God is the permanent self-existent creator and operator of man and the universe and everything transient."
If your God does not meet at least this generic concept of God, then it is not worth believing in, nor denying: because it is a deficient God.