I mean he did argue that they aren't a religious symbol before. He later contradicted himself and said that they are but I would not be surprised if he made that stupid argument again.
Hm, what Article would that be?
Unfortunately the separation of state and church is not very thorough in Germany.
And then there is Article 4
Article 4
[Freedom of faith and conscience]
(1) Freedom of faith and of conscience and freedom to profess a religious or philosophical creed shall be inviolable.
(2) The undisturbed practice of religion shall be guaranteed.