I did some research, and saying he "called for stoning gay people to death" is definitely a very significant stretch, in fact its just not even correct. He was responding to someone using words in a bible verse "love your neighbor" as justification for why she accepts LGBTQ people as a Christian, and showing that a quote from Leviticus also states that they should be stoned. He very obviously was not actually "calling" for LGBTQ people to be stoned to death by bringing up that verse, he used the presence of those words in Leviticus as a counter argument for the fact that she was justifying her statement using quotes from Leviticus. Also, the wording in twitter post at the end is incorrect, it says he is calling the stoning verse itself "God's perfect law" when he clearly said it "affirms" God's perfect law, meaning the broad Levitical prohibitions based on God's (what we would call) moral standards. He was basically saying that the verse reflects the "beliefs" held by God that resulted in that law.
Here is the actual video in question:
I'd also like to point out I am not religious at all nor am I defending any of this, what you said is just not correct.