Don't all religions basically teach the same
thing?
The major
religions indeed often have similar views on ethics and
morality; for example, they all teach "love your neighbor"
in some form or another. But religious faith is more than
just a system of ethics. The world's faiths have different
-- and often contradictory -- views on some core issues.
For example, Jews (and others) reject the idea that Jesus
was the Son of God. Hindus believe in reincarnation. And
Buddhists don't believe in a personal God at all. While
their ideas about morality may be similar, the central
teachings of the world's religious faiths frequently differ
in importaint and irreconcilable ways, which means they
hardly "all teach the same thing."