I’m hopeless at debating and presentation. I know Baha’u’llah has the truth just not how best to present it.
It doesn't seem like anyone is. I have no good reason to believe that anyone knows or has the capability to know their fantastical claims about their religion.
It is presented just as we are asked to do, no more no less.
If one looks for proofs in this material world they can be found in all nature, but the Word of God is beyond what our senses can perceive.
"....Know thou, moreover, that the Word of God—exalted be His glory—is higher and far superior to that which the senses can perceive, for it is sanctified from any property or substance. It transcendeth the limitations of known elements and is exalted above all the essential and recognized substances. It became manifest without any syllable or sound and is none but the Command of God which pervadeth all created things. It hath never been withheld from the world of being. It is God’s all-pervasive grace, from which all grace doth emanate. It is an entity far removed above all that hath been and shall be."
Then it continues and Baha'u'llah offeres why some will not see this,
"We are loath to enlarge on this subject, inasmuch as the unbelievers have inclined their ears towards Us in order to hear that which might enable them to cavil against God, the Help in Peril, the Self-Subsisting. And since they are unable to attain to mysteries of knowledge and wisdom from what hath been unraveled by the Source of divine splendor, they rise in protest and burst into clamor. But it is true to say that they object to that which they comprehend, not to the expositions given by the Expounder, nor the truths imparted by the One true God, the Knower of things unseen. Their objections, one and all, turn upon themselves, and I swear by thy life that they are devoid of understanding."
Then it continues with the logic of creation,
"Every thing must needs have an origin and every building a builder. Verily, the Word of God is the Cause which hath preceded the contingent world—a world which is adorned with the splendors of the Ancient of Days, yet is being renewed and regenerated at all times. Immeasurably exalted is the God of Wisdom Who hath raised this sublime structure.
Look at the world and ponder a while upon it. It unveileth the book of its own self before thine eyes and revealeth that which the Pen of thy Lord, the Fashioner, the All-Informed, hath inscribed therein. It will acquaint thee with that which is within it and upon it and will give thee such clear explanations as to make thee independent of every eloquent expounder.
Say: Nature in its essence is the embodiment of My Name, the Maker, the Creator. Its manifestations are diversified by varying causes, and in this diversity there are signs for men of discernment. Nature is God’s Will and is its expression in and through the contingent world. It is a dispensation of Providence ordained by the Ordainer, the All-Wise. Were anyone to affirm that it is the Will of God as manifested in the world of being, no one should question this assertion. It is endowed with a power whose reality men of learning fail to grasp. Indeed a man of insight can perceive naught therein save the effulgent splendor of Our Name, the Creator. Say: This is an existence which knoweth no decay, and Nature itself is lost in bewilderment before its revelations, its compelling evidences and its effulgent glory which have encompassed the universe...."
This is from the Tablet of Wisdom.
Tablets of Bahá’u’lláh | Bahá’í Reference Library
A Baha'i has determined that Baha'u'llah is of outstanding character, lived a life in accordance with that good character, thus was 100% truthful and via the proof of the Message that was given.
Regards Tony