Rudin is apparently not virulently against those who call themselves Christians but act in opposition to the Name of Christ, but those Christians who actually preach Christ's gospel and walk in God's Word!
Isaiah 621 For Zion's sake I will not keep silent,
for Jerusalem's sake I will not remain quiet,
till her righteousness shines out like the dawn,
her salvation like a blazing torch.
2 The nations will see your righteousness,
and all kings your glory;
you will be called by a new name
that the mouth of the LORD will bestow.
3 You will be a crown of splendor in the LORD's hand,
a royal diadem in the hand of your God.
4 No longer will they call you Deserted,
or name your land Desolate.
But you will be called Hephzibah,
and your land Beulah;
for the LORD will take delight in you,
and your land will be married.
5 As a young man marries a maiden,
so will your sons marry you;
as a bridegroom rejoices over his bride,
so will your God rejoice over you.
6 I have posted watchmen on your walls, O Jerusalem;
they will never be silent day or night.
You who call on the LORD,
give yourselves no rest,
7 and give him no rest till he establishes Jerusalem
and makes her the praise of the earth.
Unbelievers sometimes conspire to hinder the cause of Christto threaten our gospel-spreading plans, and even our lives. This troubles and burdens our souls because we want the word to run and triumph. So we wrestle in prayer for the safety of Christs ambassadors, and the opening of many doors, and the bold proclamation of the gospel. And in our best moments of such wrestling, we do not lose our rest in Jesus.
We rest on Thee, our Shield and our Defender!We go to wrestleresting on our Shield and our Defender.
We go not forth alone against the foe;
Strong in Thy strength, safe in Thy keeping tender,
We rest on Thee, and in Thy Name we go.
Therefore, we must wrestle against every temptation to rest in anything but Jesus. And we must wrestle in prayer (not with guns or swords or bombs) against all the efforts of man and Satan to hinder the spread of the gospel. In all this, our wrestling is not a substitute for resting, but a means of resting.
~John Piper, DesiringGod.org, Resting and Wrestling for the Cause of ChristTogether