Can God be evil?

No.

The definition of evil is a will that is contrary to God. God is NEVER evil. It’s impossible.

God is holy.
God is righteous and just.
God is faithful.
God is true and truth.
God is good.
God is sinless.

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Leviticus 19:2 — "Speak to all the congregation of the sons of Israel and say to them, `You shall be holy, for I the LORD your God am holy.

1 Peter 1:15 — but like the Holy One who called you, be holy yourselves also in all {your} behavior;

Deuteronomy 32:4 — "The Rock! His work is perfect, For all His ways are just; A God of faithfulness and without injustice, Righteous and upright is He.

Psalm 11:7 — For the LORD is righteous, He loves righteousness; The upright will behold His face.

Psalm 119:137 — Righteous are You, O LORD, And upright are Your judgments.

Deuteronomy 7:9 — ~"Know therefore that the LORD your God, He is God, the faithful God, who keeps His covenant and His lovingkindness to a thousandth generation with those who love Him and keep His commandments;

Psalm 89:1-8 — I will sing of the lovingkindness of the LORD forever; To all generations I will make known Your faithfulness with my mouth.
For I have said, "Lovingkindness will be built up forever; In the heavens You will establish Your faithfulness."
"I have made a covenant with My chosen; I have sworn to David My servant,
I will establish your seed forever And build up your throne to all generations." Selah.
The heavens will praise Your wonders, O LORD; Your faithfulness also in the assembly of the holy ones.

Psalm 31:5 — Into Your hand I commit my spirit; You have ransomed me, O LORD, God of truth.

John 14:6 — Jesus *said to him, "I am the way, and the truth, and the life; no one comes to the Father but through Me.

John 17:3 — ~"This is eternal life, that they may know You, the only true God, and Jesus Christ whom You have sent.

Titus 1:1-2 — Paul, a bond-servant of God and an apostle of Jesus Christ, for the faith of those chosen of God and the knowledge of the truth which is according to godliness,
in the hope of eternal life, which God, who cannot lie, promised long ages ago,

Psalm 25:8 — Good and upright is the LORD; Therefore He instructs sinners in the way.

Psalm 34:8 — O taste and see that the LORD is good; How blessed is the man who takes refuge in Him!

Mark 10:18 — And Jesus said to him, "Why do you call Me good? No one is good except God alone.

1 John 3:5 — You know that He appeared in order to take away sins; and in Him there is no sin.

2 Corinthians 5:21 — He made Him who knew no sin {to be} sin on our behalf, so that we might become the righteousness of God in Him.

Hebrews 4:15 — For we do not have a high priest who cannot sympathize with our weaknesses, but One who has been tempted in all things as {we are, yet} without sin.

1 Pet 2:22 — WHO COMMITTED NO SIN, NOR WAS ANY DECEIT FOUND IN HIS MOUTH;