False religions are all demonic.
But I say, that the things which the Gentiles sacrifice, they sacrifice to devils, and not to God: and I would not that ye should have fellowship with devils. 1 Corinthians 10:20
They sacrificed unto devils, not to God; to gods whom they knew not, to new gods that came newly up, whom your fathers feared not Deuteronomy 32:17
We also know that satan is the master of confusion which masquerades as an angel of light. We see in the old and new testament satan twisting what God spoke. Here are two examples of satan distorting God's truths.
Now the serpent was more subtil (note this: satan is subtil) than any beast of the field which the LORD God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden? Genesis 3:1 (satan said every; God commanded only one)
And [satan] saith unto [Jesus] him, If thou be the Son of God, cast thyself down: for it is written, He shall give his angels charge concerning thee: and in their hands they shall bear thee up, lest at any time thou dash thy foot against a stone. Matthew 4:6
Scripture says we must become less and less, while Jesus (God the Son) must increase. With evolution we see God becoming less and less (people want religion pushed out of everything, and the mere mention of God is called pushing stuff down their throat), while man becomes more and more (man says what is moral, and becomes God [transhumanism]). This is also the general deception of Genesis 3 which echoes through false religions. The genesis 3 decption: satan said "Ye shall not surely die, for God knows that in the day ye eat thereof, your eyes will be opened, ye shall be as gods, knowing good and evil" let's reiterate - ye shall not surely die (with no God in evolution, then sinning is ok and you won't die). Your eyes will be opened (Enlightenment: a lot of atheists act like believing in a 'magic sky daddy/imaginary friend' is just a weak-minded coping mechanism. I.e. Athiests have open eyes, and Christians are dumb) Ye shall be as gods (evolution to transhumanism/singularity), knowing good and evil (today, relative morality is a result of disbelief in God ).
Satan also deals with the flesh. Our flesh is the curse that Jesus was born into. God put himself in flesh, and the judge took our punishment. Jesus taught we must be born again, that is a spiritual birth. Satan teaches, through evolution, the flesh becomes more and more while God becomes less and less (as opposed to Jn 3:30). Likewise, as Christ taught "ye must be born again [into the spirit], reincarnation teaches that you are 'born again' into the cursed flesh.
Also a lot of religions revere snakes and serpents. We see the serpent teaching (false) enlightenment in the garden. We also see religions like Hinduism teach types of meditation where serpents possess and enlighten them. Like the kundulini spirit.
Also the use of psychedelics (aka entheogens) further this deception. Psychedelic means "soul manifesting" and entheogen means "becoming divine within." Psychedelics not enlarge the pupils ("your eyes shall be open"), but many teach psychedlics open the mind/third eye/pineal gland ("your eyes shall be opened"). Psychedelics are physically harmless ("ye shall not surely die") and are perceived as relatively harmless, despite the mental health implications. Many come to a conclusion from taking thigs such as LSD, Mescaline, or DMT, that they are gods. ("Ye shall be as gods"). Revelation tells us that in the last days, the nations would be decieved by SORCERIES. Sorceries: in the greek Pharmakeia. The word "pharmacy" is derived from "Pharmakeia". Pharmakeia can also mean "the administration of drugs". And I believe the root word is something like "Pharmakeus" meaning "one who makes magic potions". Many DMT trips hold themes of snake and red dragon deities. Transhumanists believe psychedelics aid in the process of evolution.
We can also see that most religions go back to Babylon, ultimately Nimrod.
So can we learn from other religions. Yes. Would God want us learning from other religions? Maybe. And I say maybe, because while first and foremost we should know the scriptures so we are prepared for the twisting of scriptures and using the sword against principalities, God may lead people to learn about other religions; NOT to believe them, but so that the person will know the enemy. Should we take from their teachings, or believe them? [At least for the 99% most part] No. You're learning half-truths. Ideas of God's truths warped into perverted lies. So they may teach to love, and all that stuff. But they don't hold the testimony of prophecy. And they teach warped love and kindness. For example some religions will reverence animals as people. But people are scripturally more important than animals. Or perhaps they don't, but they just teach a general kindness the scripture teaches. Does that belong to them? Or did they steal what was God's? And if they know not God, what good is their kindness and fruit? Scripture teaches that love and good fruits are only by God, otherwise man's love and good deeds are in vain. The proverbs say "there is a way that seems right unto a man, but the way thereof is death," and "the fruits are by Jesus Christ," also "it's God that worketh in us," and furthermore "we know your works are not in vain in the Lord."
Edit: Now I'm thinking back to a podcast I want to find. Back in the day there were giant orgies, then the babies, and then would take those babies and sacrifice them. Today we call it planned parenthood: sexual freedom and abortion. Ecclesiastes says there is no new thin under the sun. Well in the podcast they actually elucidated further. Thy explained somethig about how today we off murdered babies for science, and back in the day sacrificed children were used for something like medicine or alchemist science.