Are Roman gods still worshipped?
No. Roman Paganism was outlawed in 391, as were all other religions except Nicean Christianity. It persisted for a while in the remoter parts of the empire, gradually fading out by the mid sixth century at the latest. Greek Paganism persisted somewhat longer. The last remaining pockets of Greek Pagans were converted in the ninth century. The only traces of Roman and Greek Paganism after that point were certain folk-beliefs, customs and superstitions, some of which were incorporated into Christianity.