When I say secular, I mean the whole idea that this is the only life we got and that once we die, that is it. Where the clash comes in here is the personal value we have as human beings with the insignificance we have in this universe. Imagine if there were a beautiful young child and I said to him/her:
"This child is a very beautiful person, BUT he/she will rot and decay away like trash because that is all he/she is (in the grand scheme of things). He/she is nothing more than insignificant trash in the grand scheme of things. We are all just biological organisms in the grand scheme of things only to have the precious value we have as human beings rot and decay away."
I see a major clash here in this quote. The only way to create harmony between the claimed beauty of the child and the grand scheme of things would be to have this universe be one that is meant for us. A universe where we are souls who are more than our biology who get to live on happily ever after with a God who truly loves us.
This harmony is what would allow the claimed beauty of the child to finally be established as firm and sound beauty. Otherwise, there would be a clash which is no different than pinning up a positive against a negative. The positive and negative would cancel each other out. Therefore, you cannot have the positive value of a human being (beauty) when you have the negative (the idea that we are insignificant trash in this universe).
That's just how life works. If you pin up a positive force against a negative force, then they will both cancel each other out. Again, the child would be significant to those who love him/her in terms of personal value. But when that gets clashed with the idea that we have no value in the grand scheme of things and that we are insignificant in the grand scheme of things, then that is when things cancel out.
When I talk about establishing harmony, I am not talking about any religion here because it is often the case that you are punished and go to hell according to some religions. I am instead talking about a truly loving God and a truly beautiful and eternal blissful afterlife. Therefore, I really hope there is such a God and afterlife. I really hope it is not some Christian based God or afterlife.