The Apostle Peter says that those who truly believe can expect to receive after they die “an inheritance that can never perish, spoil or fade. This inheritance is kept in heaven for you.” (I Peter 1:4 NIV).
How do we know that this promise will come true? Because God showed that He is capable of overcoming the power of decay and death when He raised Jesus bodily from the dead and revealed His resurrected body to over 500 witnesses (I Corinthians 15:6, I Peter 1:3).
There are other religions that claim that their God can raise people from the dead, but these religions do not have the evidence supplied by the bodily resurrection of Christ.