Is false religion can exist?

Is God confusing his people Israel, giving more than one religion across the centuries? Is God’s word ever changes? How false religions do exist.

The Holy Bible teaches that God is one, His word and thoughts never changes (James 1: 17, Malachi 3: 6) as well his path is straight and God does mean what he says. (Isaiah 55:11)
To be safe we need to learn how to examine and compare between the knowledge we hear and the knowledge written in the Holy Bible scriptures.
The story of Gamaliel the Pharisee, a teacher of the law in Israel (Acts 5: 34- 39) which is written in Matthew 15: 13 helps us to understand how a religion exists or ends.
Gamaliel’s advice to the Israeli was not to worry too much about Jesus’s disciples but to leave them in case what they preached was of God, because if this were of God, then it would succeed despite their resistance.
Then Gamaliel quoted examples of those who spoke to the Israelites of their thoughts as if it were God’s own words but what happened afterwards? They got killed and all their followers were scattered.
Christianity and Judaism both are two parts of one religion. Judaism is known as God’s promise, and Christianity is the fulfilment of the Old Testament’s prophesies specially prophesies for the coming of Messiah.
To make the picture clear, Paul has likened Christianity to a wild olive shoot; this has been grafted in among the others and now shares in the nourishing sap from the olive root, which is Israel. (Romans 11: 17) This developed a new system and a strong bond between Israel and other nations who already followed Jesus (John 10: 16), where Christians can be considered sons and daughters to the living God as well as Israel.
The Bible warns us about liar prophet but, according to Gamaliel’s words, God will disperse this liar and uproot him from the stock of his people Israel. But if the liar prophet is not a shoot in the olive tree, God will take no action against him for the time being. God will not prevent false religions from spreading, as the spirit of God is guiding only the Bible faithful, so false religions may exist, but they do not have the power to harm the Church (Matthew 16: 18).
For salvation is of the Jews (John 4:22), a new preacher should be part of the Israeli group of prophets, walking with them in partnership with God in his plan. Jesus followed the plan of God that made salvation as a gift for every creature, and he ordered his disciples to go after other sheep bringing them to the fold of Israel. (John 10: 16) This is what Jesus did to fulfil the Scriptures, and then he finished the work, which God gave him to do. (John 19: 28- 30)
The Jewish people are still waiting for the Messiah after they rejected Jesus for they considered him the wrong man, but this does not mean that God rejected them, they are still the Living God’s beloved own people. Except all nations, Israeli people have a second chance for salvation at the second glorious coming of Jesus Christ, (1 Samuel 12: 22) (Jeremiah 31: 37) (Hezekiah 37: 27) this chance is not for the dead but for the living. (Joel 2: 32, Acts 2: 21) also this offer is not made for the non-Jewish.