the quirk of birth

From Wikipedia ...

The CIA's World Factbook gives the world population as 7,021,836,029 (July 2012 est.) and the distribution of religions as:

# Christian 31.59% (of which Roman Catholic 18.85%, Protestant 8.15%, Orthodox 4.96%, Anglican 1.26%),

# Muslim 23.2%,

# Hindu 15.0%,

# Buddhist 7.1%,

# Sikh 0.35%,

# Jewish 0.2%,

# Baha'i 0.11%,

# other religions 10.95%,

# non-religious 9.66%,

# atheists 2.01%. (2010 est.).

I am guessing every religion provides for something aspirational and exclusive in an afterlife and to varying degrees would seek to deny that to non believers.

With so many religions and beliefs, can there really be a supreme being or entitiy or spirit above all others?

Is it right that the Christian God or the Islamic Prophet for example would condemn billions of people who by the quirk of birth have virtually no opportunity or likelihood to become familiar with and embrace a different religion?

If so, imo, it would be a failing.

Dex