I am firmly of the opinion that it is one's personality, which is important, not one's religion, or lack of one. During my 69 years on this planet I have met many people, some were very good and decent who tried to help others as they went through life. I have also met some very bad people who abused children physically, sexually and emotionally, cheated on their partners, and those whose business dealing left a lot to be desired. The good people were both religious and non believers . Many of the bad people I knew were 'born again' Christians who were oh so holy in church, but evil sewer rats in their every day lives.
Obviously I have met some very evil non believers too. Religion doesn't make you a good person, anymore than non belief makes you a bad person and visa versa.
If there is a heaven, good people, whether they are religious or not, should have access to it.