If you look up Laminin, you’ll see that electron micrographs of the molecule show that it doesn’t look anything at all like a Christian cross, or any kind of cross really. It’s just the conceptual diagrams that look like a cross, and that because it was the simplest way to draw the diagram in such a way as to show the connections between the atoms in the molecule.
Aside from that, the cross is a fairly simple shape, and I don’t think I would take any appearance of such a simple shape in nature to be anything significant regarding God’s hand in design.
DNA molecules are much more complex, and in my opinion, are definite, undeniable signs of God’s hand in creation.