There is an enormous difference between cooperating with others for the betterment of humanity and to affiliate with the ungodly.
Mixing and associating with the righteous and God fearing is never condemned in the Bible. No doubt clergy who’s aim is to maintain a stranglehold on their followers for want of power and wealth have abused the trust placed in them by designating other faiths as demons and false gods which their followers swallow hook, line and sinker.
But nowhere in the Bible does it refer to that Buddha or Krishna or Muhammad or Baha’u’llah by name that are false Prophets.
The Bible never teaches prejudice against other religions or interfaith.
First off, what does The Bab and Baha'u'llah say about the Buddha and Krishna? And does he mention the other incarnations of the God Vishnu that came before Krishna? I'm thinking probably not.
Next, we all know what the NT says about why Jesus had to die. God needed a perfect sacrifice to atone for the sins of all people. So, God sent his only son to die. But then he raised him up from the grave supposedly. Also, Jesus conquered death and Satan by supposedly rising from the dead. I don't believe it. And I know Baha'is have their own symbolic interpretation of the NT that makes all those Christian beliefs not true.
But why would you think that because Buddha, Krishna, Muhammad, and Baha'u'llah are not named in the Bible as being false prophets that somehow that what? Makes them true prophets? The Bible is about the children of Israel and now the Jews. The NT got added on to the Bible by Christians and it is about their prophet, Jesus. What is important in those Scriptures to the Jews? The law maybe? And the promise of a Messiah? Then for the Christians, it is about the redemptive work of Jesus. That's what Christianity is all about. They don't need the Buddha or Krishna or Muhammad. Jesus did it all for them.
So, now Baha'is are trying to make all religions fit into their progression. Go ahead, take the Bible and the NT and show me how Krishna and Buddha have anything to do with any of it? Now, if you want to say all ancient religions were tied into a people and culture but their laws and their practices don't fit into the modern world very well. That it's time to update religion. And that your religion is claiming to be that update. That it has gotten rid of a lot of superstitious beliefs. Eased up on the punishments given to those that break the laws of God. And has made it so all people from all nations and all religions can now join together and be as one under this new religion.
All they have to do is get rid of their beliefs in Krishna being an incarnation. Get rid of Hindu and Buddhists beliefs about reincarnation. For Jews, forget about their old laws and start following God's new laws that he gave to Baha'u'llah. And things about kosher foods and the Sabbath? No more, God has new teachings on what to eat and he has prescribed new special days For Christians... No need to get baptized. No need to worry about Satan. He's not real. He's only symbolic. Don't worry about hell either. It's not a real place where sinners get sent to for disobeying God. All anyone has to do is get onboard with the Baha'i program. 19 months of 19 days. One of those months Baha'is are called to fast during the day. There's obligatory prayers. And no Sunday church or going to a temple. The big gathering for Baha'is is a feast at the beginning of each month.
Great for some people, I'm sure. But what about those people that like the beliefs and practices and rituals and gatherings of their old religion? Oh, and is Moses, Muhammad, and Jesus named in Hindu and Buddhist Scriptures? I don't see why they would. They came from a different place and time and a different culture. It's only important to Baha'is to make them all fit.