Notice that the argument presented seems to assume that religions are being forced on people, so therefore, it is better to give them a choice which religion they accept.History shows us what happens when humans lack choices, as our nature begs for options. Attempts at monopolies fail - the authoritarian structure become corrupt over time, and people beg for something different when the monopoly inevitably fails to meet someone's particular needs. One way cannot last and will fragment into many. So why try and force a monopoly of religion (or irreligion) in the first place?
But we should stop forcing anything on people, religion included. Perhaps everyone will willingly choose only one religion; should we stop them? Also, people tend to choose the religion they were raised with. We should forbid this so people can choose freely?