Sorry you are in this situation.
You cannot fix this on your own, you need Marketo support.
You will probably have to get your account manager involved and try to negotiate having them fix this for you.
Use Support escalation to get around the Support person giving you that advice, it isn't correct. Find someone in Marketo support who understands this part of the sync process.
Darrell is right though, Support can fix this but nobody out here can.
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Once you enter your credentials for your Salesforce instance you're past the point of no return. The configuration of the remaining steps needs to be finished before Field Management goes back to normal; you can't back out of the setup part way through. The configuration shouldn't mess up the naming conventions of any existing Marketo fields but it will start creating new fields that it sees on your SFDC objects. If you don't want that to happen, you'll have to hide the fields from the sync user's profile in Salesforce and then reset the schema before moving forward.
Your instance is now permanently synced to that SFDC instance, though. You can turn the sync off and not using any of the SFDC related flow steps to keep any information from flowing, but there is no way to fully remove the association with your Salesforce environment without getting a new Marketo instance.
We never synced the platforms, just started the field mappings.
We deleted the user profile in Salesforce, so if I finish mappings will I just get a sync error?
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Yes, you ought to be safe. And then you can hide the fields and finally ask support to "deep hide" them.
Marketo PS has started to work on service to remove the sync from an instance, but I do not know whether it can already be offered to all customers and on all CRMs. Ask your CSM.