Sure, and 'real' stock certificates exist in a database too. But they are backed by something. Currencies are backed by governments. Bonds are backed by the issuing entity which has assets.

Bitcoins are as real as grocery store coupons I guess. No, wait, grocery stores have inventory and bricks-and-mortar, so no, not that real.

Its misleading to call something as soft as a Bitcoin a 'currency'. There, no analogies at all.