Lament Is Not Unbelief

Biblical lament is not unbelief. It is faith bringing grief into the presence of God and refusing both denial and despair because the Lord still hears.
Psalm Prayers for a Bruised Soul

When the soul is bruised, the Psalms give honest words for weariness, waiting, grief, and hope before the faithful Lord.
Grieving Honestly Before God

Faith does not require the grieving heart to sound composed. Scripture gives language for sorrow before the God who sees.