The pastor may not have expressed himself eloquently. And I don’t expect his citation of the Bible to convince those who reject its relevance. But I do hope an educated Christian like Mr Rudd would know it was not an out-of-context reference to a conception of marriage that is only marginal in Scripture.
Rather male and female becoming one flesh in marriage is a central concept that is expressed, reaffirmed, and reapplied in many different places in Scripture.
And I hope thoughtful non-Christians are interested in understanding how Christians have typically construed the Bible. A step towards greater understanding is listening carefully to those with whom you disagree.