Somebody born in space (e.g. on Mars) csn never conduct Hajj or Umrah

[Pat Mustard]

Humans could never colonize Mars. The gravity is roughly a third of Earth. Bones would be deformed and break easy.

Venus however is a viable planet for colonization. We just need to get rid of that crazy atmosphere that it has.

Venus as of now is not a good idea for colonizing it literally rains acid form the sky and 
the  amount of money and time it would take to clean up it's atmosphere would take awhile. 
Not saying it's a bad thing just saying it's a time consuming sort of deal. But on mars i get where you 
are going at with that. But either way look  at it currently the more we destroy  earth with carbon 
the less hospitable it's going to be for us. Either way were going to be a  multi planet species and starting off
on mars isn't a bad idea eventually were going be so far spread out into the stars in a few thousand years
if we have a working FTL or alcubierre drive

Even if FTL never pans out, we're better off seeding the species off system if we want to it to survive long term. Some sort of generation ship may be the solution.