You can’t turn an outdoor cat into an indoor cat
Of course you can. I have done it numerous times. As long as they are entertained enough and don’t get bored, it is not difficult at all.
Indoor Cats are safe from Diseases and Parasites
Most of common infections are airborne and can be brought into your house by a wind gust through the open door or window, a guest’s clothing or even yourself or your pet. The same way also works for parasites such as fleas and ticks. Always groom your pet before letting it inside and brush yourself and your clothing as well.
Momma Cats smother their Babies
This too is a myth. I have not found a single verified case of such incident, but there have incidences of a momma cat accidentally smothering babies while sleeping.
Cats hate Water
I believe that it is not the water that cats fear, but the noise it makes. Every single I have raised has enjoyed being bathed and purred up a storm afterwards. The trick lies in introducing the water to the kitten for the first time. If the first time is traumatic, and unfortunately this is the case most of the time, the cat will dislike the water.