Is it permissible to evade customs duties and taxes, given our knowledge that governments use these funds in ways not sanctioned by Allah? And what is the religious ruling on bringing in materials that these countries prohibit, despite their availability locally and as imports?

If the public interest necessitates the prohibition of certain materials due to their harm, poor quality, or negative impact on local products and the economy, then their import is not permissible. However, if the prohibition aims at monopolization and harming the consumer without serving a public interest, then there is no harm in smuggling them.