Can't establish Site to site VPN with Fortigate using 3G and Check point (for spoke)

Hi Everyone,

Could you please help me to establish IP Sec VPN from fortigate using 3G (behind nat) with check point (using static public IP):

In the check point i create a Interoperable device with Dynamic Address

On Fortigate 90D, i enter static public IP's check point and using Certificate authentication method (i export .p12 from check point CA and import to Fortigate)

Please help me to check the configuration picture that i attached

I'm greatly appreciate your help