In a sense and in the mind of the devotee yes but I guess in practice that might not be the case.
I'm referring to genuine faith as something that arises from within someone in their reaching to the Divine. Anyone, anywhere, in any religion can have that.
I'm not speaking about professions of faith with the mouth, for instance those who label themselves Christians, yet hate others and declare a war upon their culture and actively engage in fighting against them and their beliefs and values system. That's not Christian love, that's Christian identity and aggression.
Same thing is true with anyone part of any religion. It's about the individual and what is in their heart, not what their group affiliation happens to be, be that Christian, Buddhist, Hindu, Muslim, etc. God doesn't look at the group, he looks at the heart of the person believing.
That know them by their fruits quote was about knowing true and false prophets.
That particular passage is teaching that in the context of recognizing false prophets, but that is not the limitation of its application, of course. You find the same teaching, looking at someone's fruit as the true test, not in a context of false prophets and teachers, but in the context of disciples not judging other followers of God, criticizing the speck in their eye, while ignoring the beam in their own for doing that very act of judging. He then says following that in Luke 6:43-45
No good tree bears bad fruit, nor does a bad tree bear good fruit. 44 Each tree is recognized by its own fruit. People do not pick figs from thornbushes, or grapes from briers. 45 A good man brings good things out of the good stored up in his heart, and an evil man brings evil things out of the evil stored up in his heart. For the mouth speaks what the heart is full of.
Here clearly, this applies to everyone, not just prophets. And that also makes perfectly logical sense. You can fake beliefs, but you cannot fake genuine fruits. Even though it may take some time after one eats those, to become ill and to wither.
This fits nicely in with Paul's teachings from Romans 14 as well. 'To their own master they stand or fall'. In other words, it's not by appearances to the eyes, 'he's not following the Torah!', but rather the fruits of love that a true heart of faith bears that speaks the validity of that person's faith. You can keep every law in the book, but if your heart still is full of envy, pride, and condemnation of others, none of that matters, as keeping rules is not the Source of spiritual fruit. Love is.
When it comes to other things such as how morally good do you think one group is over another, that is harder to say. The real group might be the one that looks pretty ordinary because it is full of ordinary people.
This is interesting how you see things in terms of one group over another. I think that group division should be between those who do the will of God, to love and do no harm (Romans 13:10), and those who don't. And that is based upon the individual, regardless of group affiliation.
If it were based upon group affiliation, then those who are true in their hearts before God as understood by them through their culture, time, and language, are unacceptable to God unless they were also in the right group. That I just cannot accept as how Love works.
Jesus accepted the pagan Roman Centurion's faith, over that of every Jew in all of Israel at that time. He didn't seem to be looking at which religion he was in, other than to point out to the religious how wrong they are about judging by religious appearances instead. Reaching out in faith, is reaching out in faith, regardless of where that person is at in their lives, or beliefs, or religion.