Can demonic spirits confess Jesus Christ is Lord, and if so, is that a reliable way to test a spirit according to 1 John 4:1–3?

In 1 John 4:1–3, we are instructed to "test the spirits" and are told that "every spirit that confesses that Jesus Christ has come in the flesh is from God." This passage seems to suggest that verbal confession of Jesus' incarnation is a reliable test for determining whether a spirit is from God. However, in the Gospel accounts — for example, Mark 5:7 and Luke 8:28 — we see the demonic legion that possessed the man in the region of the Gerasenes recognizing Jesus and crying out: “What have you to do with me, Jesus, Son of the Most High God?” This shows that demons are capable of identifying and even verbally acknowledging who Jesus is. Given that, how should 1 John 4:1–3 be interpreted? - Can demonic spirits confess Jesus Christ in a way that appears genuine? - Is verbal confession alone a sufficient test of the spirit's origin? - How do we reconcile 1 John’s teaching with the demonic acknowledgment of Jesus in the Gospels? I’m hoping to understand whether this test is meant to be literal, theological, or deeper than just spoken words.