Why is every proof given for Christianity susceptible to doubt? Why is there not a definite proof of God like mathematical theorems?

Human emotions and reasoning doubt every proof that is given under Christian theology. Why do not they have definite prove that eliminates all sources of doubts? Like in mathematics * "1 + 1 = 2" * "All right angles are equal to each other" * "The sum of two sides in a triangle is greater than the third side." All these statements above can be definitely proved and leave no room for doubt (another possible condition in which statement could be false is impossible). Now, If I choose to disbelieve the biblical message then I will have to face eternal punishment (if it is true). I cannot confirm it or deny it through any means present to me for 100 percent surety. ***Why did not God gave a definite proof that eliminates all sources of doubts to the biblical message, so that other conditions are not even possible in reality? Has any Christian theologist commented on this?*** Please do not call any proof as definite in the answer as if one really looks at the current status of proofs, they are debatable. Example: Every creation has a creator. Problem: We do not know universe was created or it existed for infinite time with no beginning. also do not use this verse as an answer > “What I am doing, you do not understand now, but you will understand > later.” > > John 13:7