Screwtape Letters 25-27

I understand that Screwtape does not want people to be Christians and devote all of their energy into worshiping and believing in God, but I do not understand why he would want people that are Christians to have a purpose and be trying to make a difference. I get that if a person was trying to make a difference, they would be devoting less time to God, but they would still be doing positive things and I would not think that Screwtape would want that either. I guess either way he is not benefiting so he is choosing the option that takes less energy away from God, but I am not sure. According to Screwtape, God does not want people to make a change which is why he has "balanced the love of change in them by a love of permanence." I do not believe that. If God did not want people to try to make a differnce in the world, than there would not be so much suffering and hatred. In letter 26, he writes, "let them think they have solved by Love problems they have in fact only waived or postponed under the influence of the enchantment." Love never solves anything and usually the problems that are avoided because you "love" someone only get worse and end it heartbreak. Love is usually the problem, not the solution.