Most religions are creationist.
Think of any religious wedding ceremony.
Usually creationism isn't even mentioned.
It depends what particular religion you adhere to.
For the same reason Jewish marriages are celebrated in a synagogue and Muslim marriages are celebrated in a mosque. Marriage, when celebrated as a sacred rite or ritual, is celebrated within the religion of the celebrants and participants.
They can both be taught in classrooms. However creationism cannot be taught as if it were scientifically verifiable fact in public schools, as it is not science, and the US constitution prohibits federal or state funded (educational) institutions promoting religion. So if creationism is taught in public school, then it must be taught in comparative religion or philosophy classes, and not in biology classes.
Creationism questions are not typically found on standardized tests, as these exams are designed to assess proficiency in academic subjects based on established scientific knowledge and frameworks. Creationism is a topic that is often considered religious or philosophical in nature, and may not align with the science-based content that standardized tests aim to measure.
The Tennessee trial of John Scopes, also known as the Scopes Monkey Trial, illustrated the conflict between those who held religious beliefs, particularly creationism, and those who supported the teaching of evolution in schools. The trial highlighted the tension between religious fundamentalism and modern scientific thought in American society during the early 20th century. It became a landmark case in the debate over the teaching of evolution in public schools.
Most certainly not side-by-side. That would imply that they are equivalent notions. Evolution, however, is a scientific theory, and creationism is religious myth. Evolution belongs in biology classes, creationism in something like comparative religion courses.
There is no major religion that allows marriage between siblings. In most cultures and religions, such relationships are considered incestuous and forbidden due to concerns about genetic abnormalities in offspring and societal taboos.
Marriage
In Idaho, public schools teach evolution as part of the state science standards. Creationism or intelligent design is not part of the official curriculum in public schools as they are considered religious beliefs rather than scientific theories.
Creationism is based on religious beliefs and is not supported by scientific evidence. Teaching creationism in schools violates the separation of church and state mandated by the First Amendment of the U.S. Constitution. Science classes should focus on teaching scientifically supported theories like evolution to ensure students receive a comprehensive and accurate education.
The legalization of same-sex marriage is a positive change and does not prevent the free exercise of religion.
Creationism is faith based, and naturally faith varies from person to person; whether their religion is different or they profess to Atheism. Also, It is not something that is objectively observable, and thus cannot be scientifically verified, and this creates rifts between Faith and the field of Science.