I would not suggest removing ensolite.
Like everyone says, it provides insulation as well as lower the amount of condensation.
Removing it all down to the bare fiberglass (which will be rough and textured, not smooth) will be difficult as you will need to scrape away the bits of black foam that'll get left behind..
Find inconspicuous ensolite,.i.e under the bed storage and use that to patch problem areas.
Super 77 spray adhesive works well for patching.
Dynaflex 230 caulk works well for seams.
Zinnizer 123 primer for priming
Any high traffic latex paint for painting
, applied with high density foam roller.
Also take photos so we can all see your reno progress