Romans 2Paul doesn't actually say that. You are extrapolating to a faulty conclusion.
Again, I ask you how much of the law is required to be justified?
Jas 2:10 For whoever keeps the whole law but fails in one point has become accountable for all of it.
Therefore if you have failed in just one single point then you are not a doer of the law. Only if you keep the law perfectly are you a doer of the law.
13for it is not the hearers [n]of the Law who are [o]righteous before God, but the doers [p]of the Law who will be justified. 14For when Gentiles who do not have [q]the Law [r]instinctively perform the requirements of the Law, these, though not having the Law, are a Law unto themselves, in that they show the work of the Law written in their hearts, their conscience testifying and their thoughts alternately accusing or else defending them, 16 on that day when according to my Gospel God will judge the secrets of men's hearts through Christ Jesus.