Please clarify, with scripture, if you will, what you believe to be the church's role in salvation. Just to better understand what you are saying.
I believe we have a role in ministering the message of salvation to the lost, but salvation in itself is offered only through Christ. No one else was nailed to the cross. No one else shed their blood. No one else died and rose again defeating the works of the devil. No one else but Christ has that power. There had to be a sacrifice for sin and Christ became that sacrifice. In doing all of this, Christ, and Christ alone, provided all that was necessary for salvation. No one else had a role in this act. Salvation is a completed work. Jesus said Himself, "It is finished." All that was necessary for salvation was fulfilled upon the cross. That we are to witness of this gift to others is a given, but we are nothing more than witnesses to the act and we can do nothing more to perfect the gift He so freely provided.
Apologies for not pinging you to my response.
Salvation is not a "one time" event, but an ongoing process until "the end" (Matthew 10:22; 24:13; Mark 13:13). Through the Church, we receive the Sacraments which help us grow in grace.