Every good relationship, especially marriage, is based on respect. If it's not based on respect, nothing that appears to be good will last very long.
A successful marriage requires falling in love many times, always with the same person.
Marriage is almost as old as dirt, and it was defined in the garden between Adam and Eve. One man, one woman for life till death do you part. So I would never attempt to try to redefine marriage. And I don't think anyone else should either. So do I support the idea of gay marriage? No, I don't.
Alzheimer's disease is never an 'accident' in a marriage. It falls under the purview of God's sovereignty. In the case of someone with Alzheimer's, this means God's unconditional and sacrificial love has an opportunity to be even more gloriously displayed in a life together.
The media seems to think only abortion and gay marriage are religious issues. Poverty is a moral issue, it's a faith issue, it's a religious issue.