There is nothing debatable about gay marriage. Homosexual acts are a "toeva", an abomination carrying the death penalty in the Torah. While no one I know of support this (and Jewish law makes carrying out the death penalty difficult anyway), there should be no question about sanctifying homosexual marriage. It is an affront to god. Sadly, Reconstructionist, Reform and now Conservative (Masorti) Jewish Rabbis will marry homosexuals. This is a Chillul Hashem, a desecration of God's name. These are no longer Jews but Frankist heretics.
Ironically, the Halakhah is actually stricter for non-Jews. For Jews, if the pre-born child is a rodef (pursuer, one who is on his way to murder someone), then abortion is not only permitted, but mandatory. Only when the child has begun to emerge from the birth canal is abortion of the child forbidden for any reason whatsoever (even the life of the mother). For non-Jews, however, this point is reached much earlier (probably your forty days). From this point abortion is forbidden even to save the life of the mother. RaMBa"M cites the verse shofekh dam ha'adam ba'adam, damo yishafekh (he who sheds the blood of man within man [ie, as a fetus], his blood shall be shed").
Jewish law makes carrying out the death penalty difficult
True, but capital crimes remain capital crimes even when no one has the authority to execute punishment (it is assumed the carrying out of the sentence is left to G-d). However, there were times in the past (even in the Exile) when Jewish communities had the authority, with the permission of the host government, to carry out capital punishment. Noachides are subject to capital punishment as well and some day these laws will be in full force.