To post a review on Google without a Gmail account, you can follow these steps:
Go to Google Maps and search for the business you want to review.
Click on the "Write a Review" button.
When you're prompted to sign in, click on the "Create account" link.
On the next page, select the option to "Use my current email address instead."
Enter your email address and password, and click on the "Next" button.
You will then be redirected back to the reviews page. You can now rate the business and write your review.
Click on the "Publish" button to submit your review.