how do i access my gmail account from my icloud account?

You don't. You access Gmail from either the Apple Mail app (see Add an email account to your iPhone, iPad, or iPod touch - Apple Support) or one of the other mail apps (e.g. Google's Gmail app) that work with Gmail. Alternatively you can also access your Gmail account from a web browser on iOS.

I think you want to ask "how to restore my gmail from iCloud?" If so, than you need to restore your iPhone from your iCloud account! And I don't advice you to back up your gmail on iCloud as it will take more space!! And it's already saved on your gmail.

How would someone restore Gmail from an iCloud account

You don't do it thru iCloud. You set it up as a seperate account in the Mail app.

Settings > Mail, Contacts, Calendars > select Add Account > select Google > then enter your Gmail address and password.

Hello, if you backed up your gmail account on iCloud then when you activate your iPhone will ask you if you want to restore it from your iCloud account or restore it as new? In this case you need to do restoring from your iCloud account. And you might backed up on your computer. And if you don't have a copy of back up then you will never get it restore it. In the other hand, your gmail saved in your gmail account! and all what you need to do is add your gmail account to your mail and everything is done.

If redundancy is what you seek forward your gmail to Your iCloud address.

Nonsense, it will not.

OK, let me know then

Waiting for you to explain.

my contact in gmail account how can i syg contact in my iphone

On your iPhone, go to Settings>Mail, Contacts, Calendars. Tap "Add New Account". Select Google. Enter your credentials

Start a new thread, explain what you want to do in it.