I generally agree with the division of state and church, the church will get corrupted if it involves itself as institution too much into politics. BUT individual christians can and should work to do the will of God and if they are politicians, they can and should do the will of God also in politics.
Agree or Disagree?
Matthew 6,33
But seek first his kingdom and his righteousness, and all these things will be given to you as well.
The policies and decisions, with either church or state, religious or secular public institutions, should be consistent and meet universal standards of truth and justice for the common good.
The difference is that internal policies respect personal choices and FREE WILL of individuals, while public policies affecting external security and commerce in society are LEGALLY REQUIRED mandates that all the governed people CONSENT to make mandatory.
We have to AGREE what remains rights and choices of the people, what is delegated to State levels of govt, and what is authorized to federal govt.
Where we have differences in beliefs, that is where govt is not supposed to be abused to establish religion, penalize or force people over faith based preferences, or discriminate by creed.
Unfortunately, people being imperfect and biased keep using parties and political lobbying and leverage to force their beliefs through govt to dominate, overrule and exclude others.
US Govt and Constitutional laws were intended to give people representation and process for checking and reforming govt to address and prevent abuses.
We will see if the power of the people, by our free will, freedom of speech and press, and right to petition to defend our free exercise of beliefs and equal due process and protections, is enough to overcome the constant abuse of political power to push onesided beliefs through govt at the expense of others.
Ideally, we should respect all people's beliefs, and not abuse govt to violate anyone's beliefs and freedom.
But after things go wrong, and once overreaching policies and corrupt waste of taxpayer money are established through govt, then all parties compete to fix the problems by their beliefs. So they both claim the other is abusing govt.
The conflicts between ideologies or "political religions" must be resolved first, directly between the people, BEFORE we can reform govt policies to reflect any such agreed solutions. If political groups keep fighting to push just their ideologies through govt, the problems get worse.
Govt was not designed for establishing beliefs by imposing mandates on others.
The sustainable principles of self govt work based on consent of the people so that authority of law is binding.
There is no separation of church and state where people compete in groups to force their beliefs on everyone else.