Christ certainly as depicted in the Gospels did believe in everlasting punishment, and one does find repeatedly a vindictive fury against those people who would not listen to His preaching — an attitude which is not uncommon with preachers, but which does somewhat detract from superlative excellence.
You will find that in the Gospels Christ said, “Ye serpents, ye generation of vipers, how can ye escape the damnation of Hell.” That was said to people who did not like His preaching.
Russell seems confident that he knows exactly how to interpret Christ’s motivations. This dubious assumption seems to be at the heart of so much of New Atheist thinking. In fact, most theists agree that we’d consider Christianity to be false if the straw man presented by the New Atheists was much at all like actual teachings of Christ.
In attempting to criticize religion, Russell opposes Christ for criticizing the religion of his day. Russell is so confident that Christ uses the phrase “generation of vipers” simply out of anger at those who don’t accept his teaching that he fails to notice that Christ reserves this kind of talk for corrupt religious leaders. He is consistently gentle with those who aren’t smugly self-righteous.
Anyone who is deeply angry at corrupt religious practices, as Russell and the New Atheists claim to be, ought to love these words of Christ. He made it clear, in no uncertain terms, what he thinks of judgmental religious attitudes. And, yet, the bombastic, anti-religious writings of the New Atheists have complained that Christ should have been gentler toward the self-righteous religious bullies of his day.
Unintended though it is, I think it is fitting that Russell and the New Atheists end up attempting to defend the Pharisees from Christ, in that they act so much like Pharisees themselves. To me, they stand as an excellent reminder to constantly turn the finger of accusation inward. Failing to do so, on a long enough timeline, will allow self-righteousness to fester and, indeed, drive us away from the love and truth of Christ–Hell by another name.