The Problem with Christians

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Are you sure? I must have missed it. Either way, saying that there is no designer because people get cancer is a poor argument.

You have yet to demonstrate that. If God created everything; then God either created cancer purposefully or didn't correct his mistake, meaning God is either malevolent or incompetent.

What it really seems to boil down to is that because the universe is not perfect, there is no designer? Is that a fair summary of your point? 

Also I like I said before, the same laws of chemistry that enable life as we know it to exist also allow molecules to unfavorably interact with DNA to damage it. 

Maybe the fact that biological systems are damageable is a sign that we are becoming genetically weaker as a biosphere, which points to the idea that it was once superior in the past. It indicates that we are declining rather than improving.