Open your mouth for the mute,
for the rights of all who are destitute.
Open your mouth, judge righteously,
defend the rights of the poor and needy. (Proverbs 31:8, 9 ESV)
Having a social conscience is not a replacement for declaring the gospel. Yet, a genuine gospel will produce a community of believers with a social conscience. One should not displace the other, nor one be set aside for the other.