In Another World With My Smartphone (Manga) Vol 11

Touya has challenged the Church of Ramissh, claiming its god is nothing more than a myth, and thanks to the god who granted him his powers, he can prove it! But Touya can't get too caught up in religious philosophy-after all, he's got an order of knights to establish, and more than a few wedding preparations to make! Yen Press
(W) Patora Fuyuhara (A) Soto, Eiji Usatsuka