Is there a way to tell?
Micah 6:8
He has shown you, O mortal, what is good. And what does the LORD require of you?
To act justly and to love mercy and to walk humbly with your God.
John 6:28-29
Then they asked him, "What must we do to do the works God requires?
Jesus answered, "The work of God is this: to believe in the one he has sent."
1 John 3:21-23
Dear friends, if our hearts do not condemn us, we have confidence before God and receive from him anything we ask, because we keep his commands and do what pleases him.
And this is his command: to believe in the name of his Son, Jesus Christ, and to love one another as he commanded us.
James 1:27
Religion that God our Father accepts as pure and faultless is this: to look after orphans and widows in their distress and to keep oneself from being polluted by the world.
Matthew 7:16-20King James Version (KJV)
16 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
17 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
18 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
20 Wherefore by their fruits ye shall know them.