Since when was I a Christian Soldier?

Since when had I become a Christian Soldier?
Was it when I was first baptized?
Was it when I had first received the Holy Spirit?
Was it when I had first told my friends about the Gospel?
Was it when I started to do divine work?
When exactly was it?

“Before I formed you in the womb I knew you,
before you were born I set you apart;
I appointed you as a prophet to the nations.”
(Jer 1:5)

Before the dawn of time,
I was already a Christian Soldier.
I was destined to be, chosen to be, glorified to be.

Therefore, I shall unsheathe my sword and fight to the end.
For if I don't, I am of no use to the Kingdom of Heaven.
And if I perish, I perish. (Esther 4:16)