If some people who are different do something in different ways and their results are equally different, how can we say that they are doing the same thing? If they were doing the same thing, they would have followed the same trend and method. If what they are doing is the same, then their results would have been the same. But since their outcomes and results are different, then it is obviously clear that what they are doing are different.
This is the same analogy with the different religious sects in the world. How can someone believe that we are serving the same God? Our beliefs patterns are not just different they are opposing! Our methods of worship are absolutely different. What we use in carrying out our worship practices are very different. So, it is evident that we are not serving the same God. We are not worshipping the same God. The gods that we are worshipping are as different as our religions are. All of us in the world are not worshiping the same God.
Then the question now is, if all the gods are different, who is then the true God? Is there actually a true God? Yes, there is! The God of creation is the true God. He is the God of the Bible. Any other God aside from this one is not the true God. The true God rules the entire universe. He sent His Son Jesus Christ to come and die and pay the price of our sins.