I think "walk through the bottomland" also means to face dark times or depression.

but to second frogprince, here's some more of his lyrics:

"And the dove flew down beside him
And a fork appeared right in his hand
And with everybody watching
The preacher ate that bird right there and then

And now everyone got really nervous
And the preacher he did start to glow
And as we watched in disbelief
These were the words he spoke

He said now Mama's in the kitchen
And she's been there all day
And I know she's cooking something good
So let's bow our heads and pray
And he sang

To the Lord let praises be
It's time for dinner now let's go eat
We've got some beans and some good cornbread
Now listen to what the preacher said
He said to the Lord let praised be
It's time for dinner now let's go eat
"