For context I guess, here’s my views on the list you posted, as someone who is very much not religious and dated plenty before finding my fiancee:

• Marriage might be awesome for some, but it’s also not for everyone, and there are far too many bad marriages that could’ve been good casual relationships

• Standards are definitely good to have, but I guarantee mine are very different than the average Catholic

• No shame in being single. Better to be single than in a toxic relationship just for the sake of a relationship.

• I probably couldn’t see myself marrying a religious person, but if their beliefs don’t infringe on other’s rights then I guess they can do them.

• Sex is just sex, cohabitation is convenient, cheaper, and pleasant. I’ve never been married and I’ve lived more of my adult life with a roommate or partner than not. I also don’t believe sex needs to be confined within the boundaries of a relationship either, and I have sex with people that aren’t my fiancee, both with and without her, though that’s definitely uncommon and always done with the full consent of all parties.

• Dating could be for finding a future spouse. It could also just be for fun, or for a casual relationship, or a long term relationship with no intent to marry.

• Relatively wide variety in how long people date before marriage, if ever. I never planned on it for years, but I met my fiancee and changed my mind. We dated for a year before getting engaged.

• Normal to date in highschool.

Obviously this is only my perspective. No judgement, to each their own. Other than the views on polyamory (though more accurately, just sex. Open relationship? I don’t have a label for it), these opinions seem very common among the average dating population. My sample may be skewed since I’m bisexual and over half my relationships have been gay.