1. As Jesus was speaking, they believed. Obviously they believed His Word. No one can believe unless they are "of the truth".Addressed. Now answer what they believed?
When later? Please affirm that those who believed, rejected Him a minute later. What belief did they hold that they rejected?
To which Father did Jesus say they belonged?
Can you rebut or only claim, "another one bites the dust"
2a. The very same ones who believed were the ones He maintained that conversation with
30As he was saying these things, many believed in him.
31So Jesus said to the Jews who had believed him, “If you abide in my word, you are truly my disciples, 32and you will know the truth, and the truth will set you free.” 33They...
2b. It doesn't matter what they believed. What matters is THAT they believed. To qualify to believe you must be "of the truth".
3. Again, the Calvinist error is thinking heart conditions/sonship are immutable. I address that error here.