No, my strength lvl had nothing to do with the Cursed Abbey, just with my max strength for my mage char (so I may wear the Larian/dragon armour 60/70 strength).
I normally enter this Abbey at about lvl 20 - it can be done at lower lvl if you have lightning and meteorstrike - and purple potions to boost up resistances in the trapped area.
I did this once at lvl 15 or so, just to check which teleporter scrolls solve the teleporter quests. But it was a bit more strenuous than going in at higher lvl.
Kiya
