Church is used two ways in the scriptures...One is the collective, spiritual Body of Christ...The other is various called out assemblies of believers, churches...
Also in the Bible, Jesus says, “Whose sins you shall forgive, they are forgiven them; and whose sins you shall retain, they are retained.” John 20:23
This promise is given to all spirit indwelt Christians...
You guys don't look at scripture very closely, do you??? You'll notice that if a sinner forgives the sins of another sinner, the other sinner is forgiven (already)...But if YOU retain another sinner's sins, they are retained, BY YOU...
Bearing in mind that we know God will forgive any and all sins, 1Jn_1:9 If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness., regardless of who retains them, it might be wise not to retain anyone's sins...
Mar_11:26 But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses.
Says who? You?