Given the task definition and input, reply with output. In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

In Christian theology , justification is God 's righteous act of removing the guilt and penalty of sin while , at the same time , declaring the ungodly to be righteous through faith in Christ 's atoning sacrifice .
In Christian theology , justification is God 's act of pardoning someone 's sins , because of their belief in Christ .