With that, here goes.
"How can you tell if you have an elephant in the refrigerator? You can see the footprints in the butter."
Yuck, yuck. The obvious thing here is, that if there is indeed a pachyderm in the old Frigidaire, then it should be so obvious as to not need to look for clues in the butter tub.
How can you tell that you are a Christ follower? It should be obvious to all around you, including yourself. You should not need to look for footprints in the butter.
How is your elephant-ness doing? If we are so like the world around us that the butter is the only clue, perhaps we should change that a bit.
From Psalms:
BOOK I
Psalms 1–41
1 Blessed is the onewho does not walk in step with the wicked
or stand in the way that sinners take
or sit in the company of mockers,
2 but whose delight is in the law of the LORD,
and who meditates on his law day and night.
3 That person is like a tree planted by streams of water,
which yields its fruit in season
and whose leaf does not wither—
whatever they do prospers. 4 Not so the wicked!
They are like chaff
that the wind blows away.
5 Therefore the wicked will not stand in the judgment,
nor sinners in the assembly of the righteous.
6 For the LORD watches over the way of the righteous,
but the way of the wicked leads to destruction.