The cover is to convey the concept of the book, that Christianity has become corrupt and toxic. To represent that concept, I suggest the following imagery.
The beautiful sun in the sky.
Nice, not necessary: A very slight, almost indiscernable sillouette in the sun of a man with long hair (what people typically associate with Jesus).
A cross casting a shadow on the foreground.
Nice, not necessary: The cross has signs of rotten-ness.
A lush field of flowers and grass. Where the shadow of the cross falls, the flowers and grass are dead or dying.
Very similar to the primary concept except the perspective is from the closest flower (the foreground) instead of a perspective where the foreground is not dominant.
I have attached two images that could work for the alternative concept. I have also attached my intial sketch mock-up of the primary concept.
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Client require book cover here Regards ALEX Relevant Skills and Experience 5 year experience in designing in book cover Proposed Milestones $150 USD - Book cover