Cross bikes already have a lower gearing than traditional road bikes. Your lowest gear is probably 36-25 or 36-26 which is pretty low. If you want to go lower you'd have to start looking at a triple front or a mountain bike cassette out back or both. The long wheelbase will help with climbing too. So, short answer: It's not the bike's fault.
Fact is, some hills are just steep enough that you're going to have to stand and hammer up them. Just keep doing it over and over and over and over. It will never get easier, but you will get up them faster.