God is righteous and holy. So much so that He literally cannot tolerate sin of any kind and must judge and punish it.
God is merciful and loving. So much so that He literally cannot leave us without a chance for our lives and our very souls.
God is not one or the other as far as His judgement and His mercy. He is both just and merciful. God must punish sin, but Jesus came to take that punishment for us so we could be given mercy. That way justice can be served and mercy can be given at the same time!
The choice is yours, but God would rather forgive you than judge you!
Ezekiel 33:11; John 3:17; 1 Timothy 2:4