The cracks are areas of tension where the pads are pulling away from each other due to the shrinkage.

Since the marble was installed over a wood sub-floor, which I assume was plywood, the creaking or squeaky sound is probably due to the plywood not being attached properly.

Most Granite slabs are either 3/4″ (2cm) thick or 1.25″ (3cm) thick, and the standards are based on those thicknesses. The thinner the stone the less breaking strength the stone will have.

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First of all you need to determine what kind of tile to install? It needs to be slip resistant, and it needs to provide a relatively flat surface so no one trips. If you are in a freeze thaw area then the tile needs to be freeze thaw stable.

Tile lippage is the difference in height between two adjacent edges of tile, or of a crack or of a control joint in concrete.

Normally Squeaking floors is caused by the plywood sub-floor not being well attached to its base and when you walk on that portion of the floor it moves, which causes the squeak sound.

Regardless of what type of tile you install over your garage, none of the installations will be waterproof unless you waterproof under the tile first.

It is possible to embed 12×12 inch ceramic tiles into a freshly poured concrete slab, but there are a lot factors to consider. It is recommended to let the concrete cure for 28 days before adhering the tile to it.

First of all if it was installed correctly you wouldn’t have a problem. To fully figure it out I would have to perform a forensic intrusive inspection, which probably isn’t practical for a small shower.