holy brothers
The late Rabbi Shlomo Carlebach, zt"l, who traveled the world in his lifetime spreading teachings of love and connectivity through his stories and songs, speaks of this idea when he says:

"Thank
G-d, the religions are getting together more and more, people are getting
together. And I don't mean to make gefilte fish (a Jewish delicacy which is made
out of many different kinds of fish) out of religions, which sadly enough, hurts
me a little bit. Some people think, let's make a gefilte fish out of all
religions; everybody put a spoon in, and let's make a new soup. This is not what
I am talking about.
What's happening in the world is that everybody really wants
to know: What do you think? What do you believe in?
It
doesn't mean that I have to change. If I see that somebody else has a beautiful
nose, it doesn't mean that I have to take off his nose to put it on my face. He
has his nose and I have my nose. I'm just looking at his nose and seeing that it
is beautiful. You know, people have to realize that basically every religion is
a revelation of G-d. All I can ask is, let me know a little bit of what G-d is
revealing to you. But I have to do what G-d is revealing to me, because if I cut
myself off from my own revelation, then again I'm not living up to G-d.
We
need something that G-d will reveal to all mankind, beyond everything in the
world, deeper than any previous revelation, something so deep and so holy. I
think the world is getting ready for it."
HaRav Avraham Yitzhak HaCohen Kook, the First Chief Rabbi of Israel, and writer of many inspiring books, wrote in his book Midot HaRiyah:
The loftiest stance in the love for
mankind must be for the individual man, and this must spread to every single
person, irregardless of differences in opinions, religions, and beliefs, and
irregardless of differences in race and climate. It is necessary to fully
understand the mentalities of the different nations and groups, to learn as
thoroughly as possible about their natures and characteristics, in order to know
how to base the love of humanity on foundations which can be put to practical
expression. For the noblest love for one's own nation, in its broadest practical
and spiritual reaches, appears only in a person who is rich in love for humanity
and for every individual man. And the narrow viewpoint which causes one to see
everything which is foreign to a particular nation, even what is outside the
Jewish people, as ugly and defiling, this is one of the awful darknesses which
bring general destruction to every edifice of spiritual goodness, whose light
every sensitive spirit longs to see.