Did Martians practice circumcision , both sexes ? If not how did this horrible practice start ?

I don't get what you meant?
I assume that you mean intelligent Martians, which do not exist.
And I don't think Martian bacteria would be able to do what you are talking about.

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Maybe he thinks "Martians" means people from Martinique.

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Or Matagascar.

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Rovers forever! - ToSeek
"The only way to explore the universe is to go and look." - Brian Cox
Well, the best way to find out is to go there and, find out. - Raven's Cry
'Evolution and science are one thing, but you don’t mess with Yoko Ono. Everybody knows that. ' - 386sx

I assume that you mean intelligent Martians, which do not exist. surely you mean do exist now? in the mid 19th century the scientific community denied the existance of dinosaures.

Yes, and they also embraced the existence of Phlogiston, which turned out not to exist. Like, say, circumcised Martians.

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
Illuminati's Razor-The most complicatedly evil answer is usually the most correct answer. - Fazor
"Every book is a children's book if the kid can read." - Mitch Hedberg
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort

This is the strangest thread I have ever seen...

and totally unrelated to evidence of any kind.

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And I think he is pulling all your chains.

Gee, you think?

__________________
"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
Illuminati's Razor-The most complicatedly evil answer is usually the most correct answer. - Fazor
"Every book is a children's book if the kid can read." - Mitch Hedberg
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort

I know. It looks like seagull doo-doo to me.

The question makes perfect sense to me, and that's good reason to be concerned.

One suggestion is that when people were naked and running about they needed skin on their privates for protection from twigs and insects and sunlight. However once people got into the habit of wearing clothes skin wasn't needed for protection and bacteria became more of a problem so hacking skin off penises could provide some protection against oportunistic and sexually transmitted infections.

While this explanation my provide some rational for standed male circumcism, it doesn't really explain penis splitting or female circumcision. Maybe they got started just to be nasty. I can just imagine someone saying, "You behave yourself or I'll split your penis!" Then after getting his penis split as a punishment the guy started acting tough and boasting about it so it became cool to have your penis split and no one ever really thought about how stupid it is.

Of course the best explanation I think is chance. People have often done stupid thing for no good reason and this is one of them.