You say round earth disproves most religions

Yes heliocentrism directly contradicts the cosmology outlined in the Bible if its taken literally (as it should be).

But a vast majority of the global population is either indifferent to the concept (they never consider it), or they blindly accept the earth as round. Therefor, the concept doesn't influence their religious practices in a meaningful way.

The vast majority do not believe the Bible, that's the point, the Bible has been undermined by pushing it as an allegorical book. Even those who placate it like the countless denominations of false Christianity and pagan variants like Catholicism do little more than pay lip service to it to forward their works based agenda's. The bible is not their final authority, nor do they take an meaningful doctrine from it. Even independent fundamentalists who do make it their final authority are forced to gloss over Genesis and other parts of the bible because of this issue and are undermined by it.

I could argue everyone blindly accepts flat earth and therefor it has no impact on their religion.

Rest assured if it was assumed by the majority that we lived on a flat earth in an enclosed firmament God would be far more prevalent in peoples thoughts than it is now. All current justifications for Atheism are completely irrelevant on the flat earth. they would not be able to placate their lack of believe with foolish idea's like evolution to Deny God. the big bang, happenstance evolutionary narrative is dead in the water there would be no alternative.

There is a lot more going on in this world to undermine the bible than the globe earth lie, theologians are there to find ways to justify theology around the science of the world, but in doing so they have had to undermine the objective standard and destroy what they are trying to protect by making apologetics for the truth. This has opened the door to moral relativism and all the filth that comes along with it as we see around us now.