There is no reason to fear losing our salvation once we have sincerely repented and followed Jesus. But you’ve got to ask yourself: Did God save me? His side of the equation is solid. God does what He says He will do. But what about your side?
How do I get to Heaven?
So you want to go to Heaven. Jesus promised Heaven for those who follow Him. He does not include anyone else in His promise. Other religions make promises they can never keep. Do you want to entrust your eternity into the hands of puny humans? Only Jesus saves.