First of all, I would like to say that I belive that faith is a gift.
However, as a physiscist, I would like to share what I think is the strongest rational argument for God’s existence, i.e. the mathematical representability of the natural laws. A well-known result of modern science is that natural phenomena can be sytematically predicted through a specific system of few mathematical equations, the laws of physics. The laws of physics describe nature in terms of quarks, quantum fields, bosons, etc.; all these terms actually refer to abstract mathematical models which are the elements of a complex mathematical theory. Unless you consider the success of the laws of physics, which represents the basis of modern technological progress, as an unbelievably lucky series of coincidences, you should agree with the idea that our mathematical models describe the intimate structure of the universe; such structure would consist of abstract mathematical relations, because this is what the laws of physics express.
Since mathematical equations and mathematical models are abstract concepts, which cannot exist independently from a mind conceiving them, the existence of this mathematically structured universe does imply the existence of an intelligent and conscious God, conceiving it according to such mathematical structures.