Mailchimp recommends using ShopSync to connect your Mailchimp account with Shopify: https://apps.shopify.com/shopsync-2
You can use ShopSync to integrate Shopify with Mailchimp. It's a free app. However, it only syncs customers who opted in to receive marketing emails. The account registration form creates customers that are not subscribed to marketing emails. You'll need to edit the account registration page (customers/register.liquid), and add an opt-in checkbox.
<div> <input type="checkbox" name="customer[accepts_marketing]" id="AcceptsMarketing"> <label for="AcceptsMarketing">Email me with news and offers</label> </div>
ShopSync got acquired by Mailchimp, and it's now the official integration with Shopify.
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