Is it a sin to be tempted? Evidently not: Christ was tempted in all points like as we are, yet without sin. (He 4:15) Then again, perhaps tempted can mean different things depending on who’s being tempted, and by what.
It isn’t a sin to be tested, merely to have sinful choices presented to us. It was in this sense Christ was tempted (Mt 4:1); He certainly had many opportunities to sin, to break God’s Law (1Jn 3:4), but He never did.
But we are tempted when we’re drawn away of our own lust and enticed. (Ja 1:14) Drawn away from what? From God, from holiness, from wisdom, purity and love. We are enticed, feeling the internal pull and attraction of sin drawing us away from the light into the darkness. This isn’t Christ (Jn 14:30): God cannot be tempted in this way. (Ja 1:13) The very suggestion of sin is repulsive to Him. (Ps 45:7)
We may not feel this is sin, to be drawn away from God and enticed; we may be confident that we aren’t in sin until our lust — the unlawful desire within us — conceives, giving birth in our hearts and minds to intent and will to pursue what’s forbidden us. After all, we’re only human.
Clearly, intending to break God’s law is sin as well (Ja 1:15a); that’s taking disobedience to a whole new level, often resulting in outwardly sinful behavior, leading ultimately to death. (15b) Considering the consequences and log-term impact of our sin when we’re feeling tempted like this is a certainly a powerful deterrent. (1Co 6:18) This is wisdom, and the fear of God. (Pr 14:16)
Yet, by definition, being enticed by a sinful choice actually is sin if being in that state necessarily violates any of God’s laws. So, we might look at it this way: Can we be loving God with all our heart, mind, soul and strength (De 6:5), as we’re being drawn away from God? Or does being drawn away from God necessarily imply that we’re already, in some way, loving Him less than He deserves? When our soul is fully satisfied in Him (Ps 63:5-6), what can draw us away? (Ps 73:25)
When we aren’t in deep communion with God, feeding on the majesty, whenever we’re distracted, tired, bitter or wounded, that same old primal lie that God doesn’t quite satisfy, and that something else will, beckons. Lust can then draw us even farther away, our desires becoming more pronounced and powerful, because we’re not fully satisfied in God, we’re not pursuing and enjoying Him as we ought, we’re not loving Him with all of our heart, soul, strength and mind. That’s how we give place to the devil (Ep 4:27), offering him ground to work in us all manner of wrongful desire. (Ro 7:8)
We may choose to live our lives in unfulfilled passion, exerting a brute force asceticism in denying ourselves the pleasures of sin for a season. (He 11:25) This is certainly better than giving in to our lusts, yet there must be a better way. (Ps 63:3)
Perhaps if we seek (Mt 7:7-8), we can find the life of Christ rooting out the sin nature itself (Ro 7:24-25a), bit by bit, realigning our internal affections in God (Ro 12:2), cleansing us of the great lie in all its insidious shades and nuance, until we’re joyfully esteeming the unsearchable riches of Christ greater than any earthly pleasure. (He 11:26) Perhaps then would grace reign through rightesouness in us (Ro 5:21), and the world would not be so enticing. (1Jn 2:15-16)