You don't understand fully. It isn't religions that decide what is truth. God decides and has decided long ago. We don't really have a choice on the future - although it is because God is loving. He doesn't want sin to exist forever. But, He gave us a choice. If we choose to worship other 'gods' at the same time as He - He is jealous for our true love. He doesn't want his worship to be combined with pagan gods. That is why the first thing that is mentioned in the prophets as to what God will command is that the 'altars be torn down.' What altars? The altars to another god. Another system. Remember Elijah - his prayers got some results. Also, the famine left the land and God caused it to rain again (after a long drought).
To make extra effect, God told Elijah to pour four pitchers of water around the wood on his own altar - 3x. I Kings 18:33-37 Similarly, there will be two witnesses in Jerusalem and when they declare that there should be no rain - there won't be any! It will be a sign as to the true God and the false god - and who is a prophet. Rev. 11:3 'and i will grant authority to my two witnesses, and they will prophesy for 1260 days, clothed in mourning - these are the two olive trees...and if anyone desires to harm them, fire proceeds out of their mouth (from speaking and God causing fire to consume their enemies) and devours their enemies, and if anyone would dsire to harm them, in this manner ...these have the power to shut up the sky, in order that rain may not fall during the days of their prophesying; and they have power over the waters to turn them into blood, and to smite the earth with every plague, as often as they desire.....'
Now, this all seems 'unfair' - but unfair to whom? To those that don't want to worship the true God? It's a choice to worship him - but yes, He is the Authority in truth. His ways bring life and peace and joy - because Satan wants death and war and has convinced people to separate from God's ways and God Himself. That has been the only result of 6000 years of man's own doing.