If you have undeniable, irrefutable proof that your God is real, then why am I not convinced by your evidence. If God is as real as the earth is round or the sky is blue, why would any rational person deny that.
Undeniable? Irrefutable? We aren't talking mathematical proofs here!
Since Descartes we haven't been able to "prove undeniable," that other minds (people) exist, or there is a real external world, or the reality of the past.
Seems you are asking for a lot of justification.
Now imagine you believed God existed (something I've argued elsewhere misses the whole point of Christianity), so what, God could care less. He is not looking for believers! He is looking for people who want to be adopted as sons and daughters.
Many will say I don't want to be adopted. Or keep raising the epistemic bar to say as Richard Dawkins does, "Not enough evidence."
To which God will say Richard you had more than most who are my children and will inherit my kingdom, but your will be done Richard, bye bye.
Nothing wrong with gathering evidence that you examine over time, but much of Christian evidence is experiential. Much is properly basic having nothing to do with evidence at all. If you approach this project as a knowledge refutation project you will never have a proper understanding of the real external world one day in your life.
Having now read your comments, calling yourself a "seeker," seems dubious. I'm skeptical of your status. However, if you are sincere and want to understand that Romans passage, Paul is pointing to a number of arguments for the existence of God (they don't get you to Jesus, just a personal, eternal, all-good, all-powerful, all-knowledgable, immaterial being.
The libnizian and Kalam cosmological arguments
And the argument from beauty (part of a larger class of transcendent arguments for Gods existence) are all helpful Google search terms.