When it comes to religion government shouldn't promote anything, including the promotion of nothing. It should all be practiced between the individual and their god(s) or the individual and their atheist nothingness. All individuals of course will draw upon their education, upbringing and experiences at the ballot box and in their day to day decision making so much of their religious or atheist thinking is in play all the time, but there must be hard limits that all respect. (So what happens when secular democracy votes in religious or political fascists? Within the same constitutional rule set that allowed such an election outcome it must be very difficult for fascists to operate as fascists, including making changes to the rules. This need has been clearly tested with the current American administration and, so far, the US constitutional system has been up to the challenge.)