Adam and Eve didn't loose the garden for not praying. They were praying. They lost the garden for not obeying.
The Israelites didn't loose the Promised Land for not praying. They lost the Promised Land for not obeying.
If you are not going to obey Jesus Christ, than why pray?
Are your prayers not being answered? Are you not obeying?
“And being made perfect, he became the author of eternal salvation unto all them that obey him (Jesus Christ);” Hebrew 5:9
