based on their beliefs and religious practices ,People worship different gods . this shows that We do not all serve the same God.
someone who performs rituals at a river is not the same as Someone who worships at a shrine before a statue .The same goes with those who worship God in a church as they are not the same with those who worship in a mosque .
it is not correct to say everyone serves the same God when you have the knowledge of these clear differences.
here are also false gods this is Just as there are genuine and fake things in the world.False gods and false prophets also exist
serving the true God is What truly matters and not whether we serve the same God. If we want to serve the true God , we must come through Jesus Christ.