Figure me

          

    Half of me sounds like ‘blackmail’

       The other half is what I am

       I’m not Santa;

       But, I’m good in that sense

       I’m not Jesus come again;

       But, daresay we share a thing or two

       I’m not all ‘Parker’, ‘potter’, or ‘kent’;

       Though, I’ve been where they went

       Yes, I’ve wept;

       And yes, like them

       What am i?

Of course, more than the letter after   ‘h’

I know what I’m not

So, believe when I say;

I’m the good news;

The world can’t yet comprehend.