Are they anti-biblical?
Jehova witnesses say that the Trinity is pagan non-sense, that Jesus Christ is the Archangel Michael, said he didn’t even die on a cross it was on a torture stake, that him dying didn’t pay for our sins and we have to work for it. On top of that when he rose from the dead he rose as a ghost. On top THAT he came back in 1914 invisible and runs everything from Brooklyn.
The Mormon church as man is God once was, as God is a man may become, you can become a God. They also say when Jesus came into existence by sexual relations by a resurrected God and the Virgin Mary, isn’t that blasphemous?
The mind science religions All deny the Holy Trinity the deity of Christ And the atonement of the cross. And the resurrection of Christ from the dead.
The rest is an excerpt from, https://www.opc.org/qa.html?question_id=470, about the Jewish faith.
There is, therefore, only one possible answer to your question: so long as Judaism rejects the claims of Jesus Christ (the real Jewish Messiah) it is indeed a false religion. This does not mean that there is no truth in it whatsoever. But it does mean that there is no saving message in it without recognition of Jesus as the Messiah. Yet even while we must say this, it is important to do so with a deep sense of humble awareness of what the apostle Paul says in Romans 11:
“But if some of the branches were broken off, and you, although a wild olive shoot, were grafted in among the others and now share in the nourishing root of the olive tree, do not be arrogant toward the branches. If you are, remember it is not you who support the root, but the root that supports you. Then you will say, ‘Branches were broken off so that I might be grafted in.’ That is true. They were broken off because of their unbelief, but you stand fast through faith. So do not become proud, but stand in awe. For if God did not spare the natural branches, neither will he spare you. Note then the kindness and the severity of God: severity toward those who have fallen, but God’s kindness to you, provided you continue in his kindness. Otherwise, you too will be cut off. And even then, if they do not continue in their unbelief, will be grafted in, for God has the power to graft them in again.For if you were cut from what is by nature a wild olive tree, and grafted, contrary to nature, into a cultivated olive tree, how much more will these, the natural branches, be grafted back into their own olive tree.”
During the Second World War, these words of the Apostle Paul were taken seriously by many Dutch people during the Nazi occupation of their country. Even though the Jews living among them did not believe in Jesus, those Dutch Christians knew that their own hope of eternal life depended on the saving work of a Jew named Jesus. They understood that it was to the Jews alone among all the peoples on earth that God had chosen to bring forth the Messiah who takes away the sin not only of all Jews who believe but also of all Gentile believers as well. And so, Yes, those who refuse to worship Jesus as God are, in effect (even though they are not aware of it) serving demons.