The quote was, [Same-sex marriage] is a destructive pretension against the Plan of God." To use simple synonyms, gay marriage is a harmful fraud (consulting an on-line thesaurus: fake, phony, put-on, false front) against God's plan for marriage.
God's plan for marriage is a man and a woman, together until death breaks their bond, faithful, exclusive, open to the transmission of life, etc.
Anything other than this (e.g. "gay marriage") is is a false front.
Any other questions?
Okie. I get it...m’arm.
Pax