Can a form be too easy to complete?

I've been working on the onboarding/registration section of my product for some time now.

We've managed to reduce the form to only one text field. Users register via social login (traditional login currently being developed) and after that the only requirement is a group name. See image below.

UX goals for registration/form is always to make it easy, intuitive and short (See here, here and here.

However, can registration/forms be too easy?

I can imagine users might have trust issues ("This can't be just it. Must be fake") or judge the product as broken or unprofessional with very easy forms.

Edit

To clarify; when someone logs in, creating a group is a requirement. Traditional login is something that's currently in development.