Well let's be honest, there's a whole heap of assertion in that article. The idea that someone who opposes some of the hateful things that some Christians say about marriage equality and abortion must therefore resent religion is one. In fact it is an outright lie.
To which bit of the article are you referring? I did not spot this generalisation about "someone who opposes some of the hateful things that some Christians say about marriage equality and abortion must therefore resent religion". I did spot the article saying this:
"One of the big lies that have been allowed to take shape in modern, diverse Scotland where all are apparently welcome is that failure to sign up to the mainstream view of society and what it means to be human is evidence of hate.
If you are anti-abortion you must hate women; if you are against same-sex marriage then you must be homophobic. It’s a falsehood and a pernicious one at that. Hatred of gay, lesbian and trans-gender people and hate crimes against women are serious and ugly issues. But knowingly to manipulate ignorance around these issues to make false accusations against people whose religion you resent is an equally serious and ugly matter."
My understanding of that was that the article was concerned about people who make false accusations of hate against people who do not hold certain mainstream views, and whose religion they resent. That doesn't read to me like a generalisation that every accusation is false or that every person making an accusation of hate resents religion, so not sure where you are seeing a lie. If Robertson states he is against bullying of LGBT people, presumably he feels his views on marriage and LGBT issues are not evidence of "hate" and wants to be able to have a debate on political issues such as the beliefs around LGBT issues taught in primary schools.
There are plenty of people like myself who don't resent religion but who do get angry about what is often done by its adherents; more to the point, plenty of Christians oppose such hateful ideas. The more I read this article the more it seems to be wanting to foster a feeling of 'them and us' and to actively stifle the debate within the churches themselves on these issues.
I was very involved in the CofE around the time of the Jeffrey John debacle and it contains a huge amount of spite against gay people. I left the church because of its poison long before I lost my faith.
Undoubtedly some religious people in Scotland can be spiteful against gay people - there is evidence of homophobic bullying in Scottish schools. I think the article was just focusing on pointing out that there are some people who resent religion and who are trying to influence social issues by trying to smear religious people who have not expressed "hate" but who do oppose a particular political ideology or social policy with false accusations of "hate".