I think all of them are true, but not everyone will agree.
True. (Not everyone will agree).
"Medical expenses are the number 1 cause of bankruptcy in America"
This is actually false, and if you pay close attention to the details of the study, you'll see it's not even at the top of the #1 reason for filing bankruptcy. FactCheck has some discussion of the issue, citing other studies and how the Hardvard one lumped "medical bills" along with other issues, including job loss.
"The US constitution prohibits establishment of religion by congress"
This certainly true on its face, but could be construed as false by omission, and implies less restrictions on Federal laws than the Constitution actually provides. The relevant text is "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof;" - so not only can they not establish a religion, they cannot make law "respecting" any religious establishment, that is, any organized church cannot be given any special dispensation at all, and, further, any religious practice cannot be interfered with. Of course, Congress has violated that one many times, probably most famously by such things as banning peyote from Native American's traditional religious practices. Ironically, the First Amendment's admonition was intended to protect people that designed their own religious practices outside of the established religions - a highly valued right with origins Colonial America's protestant value system. Yet the Native American Church was established in order to petition for protection of the use of peyote by its members. So in practice, recognizing the use of peyote by members of established religion, but not by individuals, is the opposite of the original purpose.