No one knows exactly- US law, and most state laws do NOT require registration of ordinary firearms. In 1994, a survey estimated that roughly 16% of the adults in the US owned at least one handgun. That would equal roughly 49.6 million persons that own a handgun. My personal belief is that the number is higher, since gun ownership has increased sharply over the past few years.
On average, around 100,000 people are injured by guns in America each year. This includes both intentional and accidental injuries.
Two: Hand guns and Long guns
No one record. Several million persons.
Only two; hand guns and long guns.
Millions.
Long guns, hand guns, artillery
Over five hundred billion
Your question is to vague. Do you mean in the world? The US? North America, South America, Central America, Europe? Not as many as have died in traffic accidents.
About 1/3rd of American households own at least one firearm
There are only two types of firearms. Long guns and hand guns.
1.000.000.000.000.000 people have diad cause of guns
Because we are a free nation and have rights. Many people use the guns for protection, hunting for food, killing snakes or other animals in and around their homes. Guns are not bad. Stupid people who don't know how to use a gun, or bad people who want to harm others with guns, or dumb people that allow children access to guns are the real problems.