As a Christian, it is my desire that everyone come to know Jesus Christ as his or her Savior. Here's how you can know that you will spend eternity in heaven.
The Bible tells us all are sinners.
"For all have sinned and come short of the glory of God." (Romans 3:23) The penalty of sin is death and eternal separation from God in hell. "For the wages of sin is death..." (Romans 6:23a)
The Bible also tells us that Jesus died for sinners.
"But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us." (Romans 5:8)
Salvation is God's free gift.
"...the gift of God is eternal life through Jesus Christ our Lord." (Romans 6:23) In order to receive a gift, you must take it.
How do we receive the gift of salvation?
The Bible clearly tells us. "That if thou shalt confess with they mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. For whosoever shall call upon the name of the Lord shall be saved." (Romans 10:9,10, and 13)