(OP)
"...I still haven't found in the constitution where it...forbids prayer in school..."
If you're referring to faculty-led prayer in public schools (since students are always free to pray privately to the extent they're not being disruptive, and if they don't already know what their kid(s) will be facing when they sign them up to attend a privately run religious school, that's the parents' fault), well, that'd be the Establishment Clause of the First Amendment.
"...allows the killing of humans in the womb through abortions..."
First of all, there's no such thing as "humans in the womb". Potential human =/= actual human.
Secondly, the Fourteenth Amendment states that the rights of personhood are conferred AT BIRTH, and there's also the whole privacy issue. What's more, the Thirteenth Amendment states that "involuntary servitude except as punishment for a crime, shall not exist within the United States". Even if one were to assume that an embryo or fetus is the equal of an already-born person (which I don't, and I'm not the only one--and, no, I've never voted Democratic in my life), no person has the right to make use of any part of another person's body without the other person's consent, even when failure to do so would result in certain death. That's why it's not permissible to force people to be organ donors even after they're dead. The only way that outlawing abortion wouldn't run afoul of the Thirteenth Amendment is for you to reveal your true colors, and let everyone see clearly the feeble old man hiding behind the curtain: namely, that you consider women having sexual intercourse without the intent to procreate to be a crime worthy of punishment by way of the burden of an unwanted pregnancy (and, later on, the burden of raising an unwanted child).
"...enables companies to declare emanate domain on US Citizens private property...or allow perversion through same sex marriage..."
Miles Gloriosis already answered both of these as well as I could have, so I'll just end my post here.