The truth is that we do not all believe in one God. We are serving different gods. God does not force himself on any of us. He is the true God who created everything that is in the world but he does not force himself on anyone. If you want to serve him, he allows it to be your own freewill. Do not be deceived when people say that we are serving the same God, we are not serving the same God. Everyone of us is worshiping that one that we ourselves know in our hearts that we are serving.
The truth is that all those things which people worship outside the one God of the Bible are false gods. They are not the true God. We have only one God, that God is the one who created the heavens and the earth. He is the commander in chief of all creations. We are not following the same God. Our believe patterns are different, therefore we are serving quite different things. How can the same God demand something from one and tell the other that such a thing is an abomination? It's impossible.
Who is the True God? Which God should we serve? The True God is the God of the Bible. He is the one who created the whole universe. If you want to serve the True God, the worship the God of the Bible who sent His son to come and die for our sins.