Ignoring the nonsensical myths surrounding homosexuality, there will be benefits to legalising same-sex marriage for gays and lesbians to businesses, politicians as well as bringing families even closer together for joyous special days.
Wedding businesses will flourish from catering for the needs of same-sex couples, there will be a massive demand for florists to provide flowers for weddings as well as wedding venues raking in more profits if same-sex marriage is legalised. In short, legalisation of same-sex marriage will help local and national businesses boost their profits as they will get more customers coming to them for wedding-related services. This will mean they pay more to the government and bring up the economy effectively without the need for cutting jobs in order to save money.
Civil Partnerships are already allowed in Finland, but a "civil partnership" is not a marriage. It is second-class treatment for people who are treated as second-class citizens. If the country of Finland really cares about equality, then they will consider giving equal treatment to ALL Finns and others living in the country.
Religious organisations will not even need to worry about legalisation of same-sex marriages, because marriage is not limited to churches. People can get married at the beach, out at sea, at a hotel or any wedding venues.
It's not "special treatment" if gays and lesbians are asking for what straight people have always gotten. Allowing LGBTs equal marriage is fairness, hence the term 'equal marriage.'
To achieve full equality and full human rights in Finland, I believe that the government should allow Finns to decide and vote if same-sex marriage should be legal or not in a democratic manner. Also, the members of the Finnish parliament should be allowed to have a conscious vote instead of voting on behalf of the political party leaders decisions.