“Beloved, why can’t evangelical leaders just speak the truth in love and give the gospel of the Lord Jesus Christ without the sidebar fodder of feeling like they have to be funny; relate; be relevant; or make Jesus likable.”
Why do so many Christians feel there is only one way to present the gospel (which, by a strange coincidence, always happens to be their way.)
Paul changed the way he delivered the gospel, depending on the audience he was speaking to at the time. His Mars Hill speech was appropriate for the audence he was speaking to at the time (a group of Greek philosophers), but to many other groups of the day (especially Jews) would have not only be inappropriate, but actually insulting.
Have you never seen someone that has firmly resisted the gospel their entire life suddenly open up to it when it is presented to them in a different way?
There are many valid ways to expose someone to the gospel. Instead of condeming those that are trying to reach people via unconventional/non-traditional methods, we should be rejoicing that people are being reached through these methods.
There is only one way to present the gospel. The individual known as "The Good Samaritan" demonstrated the first step when he encountered the obvious opportunity thrown into his path.
The answer to your question is simple; Warren along with numerous other "evangelical" leaders are ashamed of the Gospel of Jesus Christ and more afraid of offending men than they are offending God. Warren does not want to "offend" the sensabilities of supposed "seekers". Hence they procalim a "different Gospel" which is not another gospel at all:
I am amazed that you are so quickly deserting Him who called you by the grace of Christ, for a different gospel;
which is really not another; only there are some who are disturbing you and want to distort the gospel of Christ.
But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed!
As we have said before, so I say again now, if any man is preaching to you a gospel contrary to what you received, he is to be accursed!
For am I now seeking the favor of men, or of God? Or am I striving to please men? If I were still trying to please men, I would not be a bond-servant of Christ. (Galatians 1:6-10