Forgiveness of sins comes from having faith in Christ, the Son of God, dying on the cross not buying indulgences.

 

"For God so loved the world that He gave His one and only Son so that who so ever believed in him shall not parish but have eternal life." John 3:16

 

Jesus, the Holy Spirit, and the Father are one God in three persons.

 

Jesus died on the cross then rose again in three days wich allows christians to be resurected too.