 The ratification of this law was not devoid of conflict , despite support from 66 % of the population . Roman Catholic authorities in particular were adamantly opposed , criticising what they regarded as the weakening of the meaning of marriage . Other associations expressed concern over the possibility of lesbians and gays adopting children . Demonstrations for and against the law drew thousands of people from all parts of Spain . After its approval , the conservative People 's Party challenged the law in the Constitutional Court . 
