Hinduism is not a religion where one is compelled to go out into the world and change anyone’s mind. All paths are valid. All paths fit the current needs of the soul behind the veil of the human form within which it currently resides. Hard as it is for some to swallow, this includes atheists.
Because all jivans, even if outwardly expressing atheistic point of view, are inwardly making their way toward God. Whatever form of worship one is born predisposed to practice, culturally, regionally, what have you, it is a function of one’s personal karma. And as long as that is true, then atheism is much the same. As such, religions with all of their separate practices and outward appearances are part of the gross material world. The universal truth which we all aspire toward resides somewhere in the subtle or causal body. See Bhagavad-Gita Chapter 18, verse 61 for more on this.
That is why meditators tend to suddenly realize that all paths that we follow (on a material level) are equally valid. Because they are all directing us on the subtle path which lies beneath whether we understand that or not. In A.C. Bhaktivedanta Swami Prabhupada’s view, this underlying truth is Krishna. See Bhagavad-Gita, Chapter 18, verse 66.
And so I think it is fitting that the sacred mantra, “Om Sat Tat”, at it’s most base translation, is comparable to “True dat!”, a modern expression of concurrence among the masses in the U.S.