In the sequel, all the considered arcs are small arcs. Let $P$ be the midpoint of the $\operatorname{arc} \overparen{B C}$. Then $A P$ is the bisector of $\angle B A C$, hence, in the isosceles triangle $A D E, A P \perp D E$. So, the statement of the problem is equivalent to $A P \perp F G$. In order to prove this, let $K$ be the second intersection of $\Gamma$ with $F D$. Then the triangle $F B D$ is isosceles, therefore
$$\angle A K F=\angle A B F=\angle F D B=\angle A D K$$
yielding $A K=A D$. In the same way, denoting by $L$ the second intersection of $\Gamma$ with $G E$, we get $A L=A E$. This shows that $A K=A L$.
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Now $\angle F B D=\angle F D B$ gives $\overparen{A F}=\overparen{B F}+\overparen{A K}=\overparen{B F}+\overparen{A L}$, hence $\overparen{B F}=\overparen{L F}$. In a similar way, we get $\widehat{C G}=\widehat{G K}$. This yields
$$\angle(A P, F G)=\frac{\overparen{A F}+\overparen{P G}}{2}=\frac{\overparen{A L}+\overparen{L F}+\overparen{P C}+\overparen{C G}}{2}=\frac{\overparen{K L}+\overparen{L B}+\overparen{B C}+\overparen{C K}}{4}=90^{\circ} .$$