Well....
Laminin is actually very 'floppy' so it doesn't usually resemble a cross. Besides, a cross really isn't that uncommen a shape, it's just two lines crossing.
Besides, remember what this does for free choice. If God created life to contain laminin with the intention of showing his existence through it, that means he had allready decided that Jesus had to die on the cross, thus giving him no choice in the matter.
I think this is really just a crutch for people who don't have enough faith, just like "jesus" apearing on a tree, or piece of toast

You can see crosses everywhere if you want to, look at your floortiles for example.