If anyone desires to worship deity correctly, acceptably to that deity, then that deity should make it known to sincerely searching individuals how to do that. Such divine communication, from above to us below, would actually help prove the reality of the true God. The true God breaking through to us, to bridge the gulf between us and him, doing for us what we could never do for ourselves, would clinch that proof. Christianity proclaims the one true God to have done this through his only-begotten Son, who became human as Jesus Christ.
However, if humans desired to form a religion that they thought would be acceptable to God, they would base it on what they thought about deity, what they thought would please God, which would be back-to-front as they would be trying to reach up to God. Divine revelation might be claimed, and visitations of gods and goddesses, as in Hinduism, but the belief in millions of divine ones (from which selection people can choose their preferred household god) does give rise to the question, "Could I (or we) be worshipping the wrong god?"
This is where the stark contrast between the one God of Christianity and the multitude of gods in Hinduism can serve a vital purpose in helping answer that important question.
If an atheist can assume, for the sake of exploring such a question, that there is a true God, then reads this God's communications with his people as to the dangers of false worship, those warnings could be seen to apply to the myriad religions that turn out to be man-made attempts at placating their idea of God / gods. In Christianity, there are constant warnings from the first book in the Bible to its last book about false worship and false gods. History confirms humanity constantly multiplying gods to themselves, except in Judaism, Christianity and Islam. Those three world religions stress only one God, who alone is to be worshipped. He alone is the true God, the Creator of heaven and earth, who made man in his image.
This should narrow down the search for an atheist wanting this question answered. If there is only one true God, then it would be counter-productive to consult other religions that have lots of deities - a pantheon of them, in some cases. However, Christianity uniquely unwraps God's dealings with humanity, from their creation right into the future where he will bring in a new heavens and a new earth in which righteousness will dwell; only in the person of Christ Jesus has the uncrosssable chasm between sinners and the holy God been crossed, by the Son of God so identifying with us that he became one of us, to die as Jesus, to bear the just wrath of God for sin in his body, though he had never sinned. This unique event is only detailed in the Bible, setting Christianity apart from all other religions.
The Bible shows that our Creator denies the existence of man-made gods; they are pseudo-gods, would-be-gods, false gods. To his people God declares:
"Ye are my witnesses, saith the Lord, and my servant whom I have
chosen: that ye may know and believe me, and understand that I am he.
Before me there was no God formed, neither shall there be after me: I,
I the Lord, and beside me there is no saviour. I have declared, and
have saved, and I have shewed, when there was no strange god among
you: therefore ye are my witnesses, saith the Lord, that I am God.
Isaiah 43:10-12 A.V.
"Thus saith the Lord the King of Israel, and his redeemer the Lord of
hosts; I the first and I the last, and beside me there is no God... Is
there a God beside me? yea, there is no God; I know not any. They that
make a graven image, all of them are vanity; and their delectable
things shall not profit; and they are their own witnesses; they see
not, nor know, that they may be ashamed. Who hath formed a god, or
molten a graven image that is profitable for nothing?...
I have blotted out, as a thick cloud, thy transgressions, and, as a
cloud, thy sins: return to me; for I have redeemed thee... Thus saith
the Lord, they redeemer, and he that formed thee from the womb, I am
the Lord that maketh all things; that stretcheth forth the heavens
alone; that spreadeth abroad the earth by myself." (Ibid. 44:6 & 8-10
& 22 & 24)
The New Testament goes on to show how God redeems from sin by the Redeemer, sent to die and be resurrected to deal with sin, once and for all. That Redeemer is Christ Jesus, who reveals God the Father to sincere seekers, who assures us that God is looking for those who want to worship him in spirit and in truth. There is hope for such sincere ones, for God has already done in Christ all that they could never do to be reconciled to him. That is why Christianity is worth considering for those who want to avoid worshiping the wrong god / gods.