Christians are indeed by definition weak and lawless according to worldly standards.
Our weakness is in loving our enemies and caring for the stranger, even though it’s risky.
Our lawlessness is a rejection of any authority that would seek to usurp the Lordship of Christ who commands us to do those things.
But we are not weak, we only appear that way.
Jesus appeared weak on the cross to many, like a lamb led to the slaughter, but he defeated death there once and for all. This is how God works through Christ, and how he works through us–Christ’s Body on earth (2 Cor. 12:9-11).
And we are not lawless.
Only now we live not by laws grounded in lies and worldly commitments. These always result in suffering and death for others. No, we are empowered to live according to a different kind of law that leads us–through death to ourselves–to life. This is the law of love, which comes from the Spirit (Rom. 8, 13:10)