Benefica, It's not my goal to defend gay people. Those of you who have been around a decade or more might remember my argument with Phoenix on the derogatory use of the word "gay". I'm not a particular defender of homosexuals, or any group for that matter. This is a scientific problem. You appear to be saying that same-sex couples are less fit to raise children, and I've yet to glimpse a remotely plausible basis for that. I'd do the same thing if you posted about the moon being made of cheese.
Let's examine your latest reasoning:
1) Gay couples have an hard time to prevent their kids from being influenced by their choice of sexual life. Ok, this is debatable.
Debatable indeed. Further, this applies at least equally to opposite-sex parents. So even if it's true, how is it relevant in a discussion about the parental fitness of same-sex couples? Why does a totally mundane phenomenon transform into a problem in their case? Could it be that you're making a value judgment on sexuality? I think so. Next!
2) Children of gay couples are more prone to be mocked and harassed. Only a fool would argue this point.
Gifted children are targeted for ridicule. Should we purposely breed dumber kids? Unreasoned conformity isn't a valid reason for anything, and it might be the worst possible goal. Further, this point roughly simplifies to "We shouldn't do different things because they are different," which is a tautology that would only be seen as meaningful by a bigot.
3) Allowing a couple of males to adopt a child, leads that the child is raised without a mother. Tell me that this is irrelevant...
I suppose you're implying that growing up without a maternal figure is harmful to children. Let's examine that assumption, shall we? We just heard from the American Academy of Pediatrics on that subject:
There is extensive research documenting that there is no causal relationship between parents’ sexual orientation and children’s emotional, psychosocial, and behavioral development. (11 citations given) Many studies attest to the normal development of children of same-gender couples when the child is wanted, the parents have a commitment to shared parenting, and the parents have strong social and economic supports. Indeed, current research has concluded that “In all, it is now well-established that the adjustment of children and adolescents is best accounted for by variations in the quality of the relationships with their parents, the quality of the relationship between the parents or significant adults in the children’s and adolescents’ lives, and the availability of economic and socio-economic resources.”
And lastly:
If you prefer to say I'm prejudiced because I think that one has to have more caution with children, children are more vulnerable and more worthy of be defended than adults, so be it.
Stop hiding behind children. You are not heroically defending anyone. If you had presented
a single credible argument for restricting homosexuals more than anyone else, I'd have reason to think that you were motivated by concern for children and not prejudice. Instead I have received an increasingly suspect pile of innuendo which asserts nothing meaningful while implying that homosexuals are self-evidently harmful to children.