Should we make it possible to enter the system, without putting in onboarding information?

I think we have two options. There are multiple times I thought it'd be nice to leave the onboarding screen without filling in all my info. So, we could do one of two things:

(1) have a 'cancel login' functionality available, that logs you out of the system, or

(2) have a 'cancel login' available that doesn't record your info or what you need, but still takes you to the back-end based on what you've already included.

I like (1).
Also, it would be nice to have a pop-up box that warns people from canceling:

"Are you sure? If you leave now, you will need to log in again and include your information in the onboarding screen." Something like that.