Not much easier on a lighter bike
You've got to be kidding???! The weight of the bike is very important for climbing. I can guarantee you that the same person on a 20kg bike (44 pounds) will climb much slower that when they are on a 14kg (31 pounds) bike.
For example; find a hill, and climb up it twice and note the time it takes to do each climb. Come back the next day and do the same thing, but carry a back-pack with 22lbs in it and see if you can do the climbs in the same time, or with the same ease/exertion level. I seriously doubt you will even come close.
As peet mentioned, reduced weight generally comes with increased quality. However, it can get to a point where things become ultra-light, are high in quality, but are no-where near as reliable as something that weighs 50-60g more.
Sounds like you have some excellent areas for riding skiblur, and it is great that you are getting out there and giving it a go. But if you want to get more 'serious', then start saving up for an entry level mtb from a bikeshop. Not only will it be lighter, but the brakes, gears etc will also be better and you will enjoy the rides even more, and get permanently hooked!
Happy trails.