According to your religion perhaps but not according to God...
Jas 2:10 For whosoever shall keep the whole law, and yet offend in one point, he is guilty of all.
That's some pretty simple stuff right there...
1Jn 3:15 Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him
Oh Oh.....There goes your mortal sin...Hating your brother then is a mortal sin...They may be different to you but to God they are all the same...
On this topic, we have the very words of God himself to look at:
Jesus answered, “You could have no power at all against Me unless it had been given you from above. Therefore the one who delivered Me to you has the greater sin.” -- John 19:11, NKJV
You say all sins are the same. Jesus says they aren't. I think I'll go with Jesus on this one.