" if no one does good and these people proclaim I have the merit of Christ so I need not to do anything, how will these people become? More like God or Devil?"

The problem is the sin nature. If you tell the people stop doing wrong - they will rebell because it is in their blood. Thats what we are!! Therefore, the only real solution is to completely break off the bondage to any laws. The purpose of the law (do this, do not do that) was not to make us good, as scripture says. It was to show us that we are evil - that we cannot follow it. Jesus only could fulfill it! That was his purpose - to fulfill it completely, making him righteous and then to impute (transfer) this righteousness unto us, while our sins/crimes were transferred over unto him!!

The fruit of the real gospel - the bondage-free one, with 100% utter freedom in Christ with exactly how I described it - by grace through faith without works - will save people. It will change their essence once they truly grasp it! It will have a much greater effect on humanity than anything else (the thing you falsely / unbiblically propose). Once you tear the bondage, give 100% freedom, which we really have in Christ, people will think twice. No man likes to bite the hand that feeds them. But they are allowed to bite because God loves them.

That love that is shown to us through the cross and how it saves us; it will penetrate through the depths of the essence any human being. Therefore, you should stop tainting it with nonsens as you currently are! It is truly by grace through faith alone - this has supernatural effects on people! Believe me when I say that!!!