If you believe in God, you have chosen to reject Allah, Vishnu, Budda, Waheguru and all of the thousands of other gods that other people worship today. It is quite likely that you rejected these other gods without ever looking into their religions or reading their books. You simply absorbed the dominant faith in your home or in the society you grew up in. A rational person rejects all human gods equally, because all of them are equally imaginary.
https://godisimaginary.com
Fair enough but that wasn't my argument.
You create a paradox with your statement, you likely didn't develop this thought based on your research of all belief systems so you're in the same boat you accuse me of being in, no one can know anything unless they know everything, unless someone knows the real God then there is no need to seek out any others.
If you marry the right person, have the right job, etc you're not going to spend your life wondering about the 6 billion other options.