This a common question people ask. It is a legitimate question because of the common reality that runs through religions. On the surface it can appear that every religion is the same, and what sets them apart are just small things.
A great way to frame a discussion of Jesus is to start with the things that we have in common. The apostle Paul used this strategy on Mars Hill (Acts 17:22-23). Once we have established a common ground, then we can emphasis what sets God, as revealed by Jesus, apart from all the rest.
In this video Bruxy Cavey provides a good way to respond to the question: “Don’t we all believe in the same God?”