Q. Do Mormons have to have 7 children to go to heaven?
No, you can get into heaven with as few as zero children and as many as 100+. As Mormons become familiar with God’s plan of happiness, we begin to see the pivotal importance of family, and so many families become larger than usual as a natural outgrowth of these beliefs. We just love children!
The requirements for admittance into heaven begin with placing your faith in Jesus Christ (who suffered the punishment for your sins).
Next comes repentance, baptism by immersion and by proper authority, reception of the gift of the Holy Ghost, and enduring to the end with a penitent heart. See these articles for more:
Salvation in a Nutshell
How Many Children Should Mormons Have?
What if a Married Couple Doesn’t Want Children?
What Does Baptism Entail?
Q. Do mormons believe in salvation? Do they believe in asking God to come into your heart? Who do they pray to?
Yes, Mormons do believe in salvation. We believe that mankind may be saved through Jesus Christ and may live in the presence of God provided that we are prepared for it.
Asking God to come into your heart is a valid request but it must be noted that God has a physical body and so cannot actually dwell in our hearts. Intead, He sends the Holy Ghost to comfort us and accompany us.
Mormons pray to God, the Father, in the name of Jesus Christ.