All the transgressions that he has committed will not be called to mind against him

The idiom "call to mind" means to remember. This can be stated in active form. Alternate translation: "I will not remember all the transgressions that he has committed and will not hold them against him" (See: rc://en/ta/man/translate/figs-idiom and rc://en/ta/man/translate/figs-activepassive)

by the righteousness that he practices

"because of the righteous things he has done"