Can I use Nutralite Butter in baking Cakes and cookies?
After looking that margarine up:

It is advertised as a margarine made of mostly unsatured fats. An ingredient list is not readily found on their website (red flag ;) ) . They also claim to not hydrogenate their fats, so to make a solid margarine you are either looking at https://en.wikipedia.org/wiki/Interesterified_fat (will behave similar to butter when baking) or at some textural tricks that keep oil in a solid block (will likely behave like oil in baking).

If your intention is to cut saturated fats, I would suggest you look up cake recipes that use oil in the first place, and use whatever oil suits your culinary and nutritional taste.