How can we be absolutely sure, beyond a shadow of a doubt, that we will be included in the rapture ? 

The following Scripture tells us how we can be absolutely sure, beyond a shadow of a doubt, that we will be included the rapture, and not left-behind. 

Romans 10:9-10

"IF you shall confess with your mouth the Lord Jesus, AND shall believe in your heart that God has raised Him from the dead, YOU SHALL BE SAVED. For with the heart man believes unto righteousness, and with the mouth confession is made unto salvation."

The above scripture tell us there are ONLY two requirements for your salvation. IF you want to be raptured and spend eternity with Jesus, then you Must declare with your mouth that Jesus Christ shed His blood on the cross to cleanse you from all your sins, And you Must believe in your heart that God raised Jesus from the dead "YOU SHALL BE SAVED".  That is absolutely all there is to it !!!  There is nothing more required of you !  Jesus did 100 % of everything required by God, for your salvation.

It is your 100% guarantee, beyond a shadow of a doubt, that you will be raptured and then spend eternity with Jesus. 

According to Your Word, come Lord Jesus !