Hi @aravind_ -- Yes, I believe you can import Salesforce data into Adobe Analytics and vice versa. There are some apps in the App Exchange that may be able to help.
Customer attributes is an Experience Cloud service. I would have your client reach out to their account manager if they do not have access to it to discuss options. I believe Adobe Target is also required to use it. If your client does have Customer Attributes, an administrator would need to add you to the Customer Attributes user group so you can access it.
I cannot think of any other features in AA for demographic data. Hopefully, someone else can chime in if they have ideas.