theme name is Fo mo dao xian buddhism, also would apreciate if you tell me what does that mean.
The big character on the first image is 魔 (demon) and the poem is a statement from the perspective of 魔
The big character on the second image is 道 (The Truth/ The Way) and the poem is a statement from the perspective of 道
In the philosophy sense 魔 and 道 are the opposite of each other:
道 represents 'enlightened mind' that extended to 'just, peaceful, kind, selfless and everything positive'
魔 represents 'fallen mind' that extended to 'unjust, violent, cruel, selfish and everything negative'
As for the two poems:
(The universe is unkind, what is the use of begging for mercy? I'd use my blood to paint the blue sky red; Three thousand years since I had submitted to the way of demon, looking back at the mortal world, I'd rather not being a god)
(Experienced the vast ocean, it is hard to be a pool of still water; Experienced the grand cloud-sea on top of Wushan, other clouds are no longer impressive; In the middle of an endless flower field, I don't have the desire to look back; Either you can achieve all these or not, half depend on the study of Dao and half depend on yourself )