I just heard another preacher say “no one is perfect, only Jesus was perfect”.

Is this true? No.

We find our perfection in Jesus. In baptism his blood washes us of our sins. After baptism he willingly forgives us in response to our act of confession. 1 John 1:9. Strength to walk in the light and remain sin free comes from Jesus, in him we trust.

If we could not be perfect why would Jesus have said in Matthew 5:48 KJV,
Be ye therefore perfect, even as your Father which is in heaven is perfect.

In Job 1:1, God calls Job a perfect and upright man. Just as Job was perfect so can we be perfect. It’s not only a matter of actions it’s a matter of faith.